This article is about the machine. For the Leroy Anderson composition, see The Typewriter.
Mechanical desktop typewriters, such as this Underwood Touchmaster Five, were long-time standards of government agencies, newsrooms, and offices

A typewriter is a mechanical or electromechanical machine for writing in characters similar to those produced by printer's movable type by means of keyboard-operated types striking a ribbon to transfer ink or carbon impressions onto paper. Typically one character is printed on each keypress. The machine prints characters by making ink impressions of type elements similar to the sorts used in movable type letterpress printing. At the end of the nineteenth century the term typewriter was also applied to a person who used such a machine.[1]

Video on the history of typewriters and how they operate

After their invention in the 1860s, typewriters quickly became indispensable tools for practically all writing other than personal correspondence. They were widely used by professional writers, in offices, and for business correspondence in private homes. By the end of the 1980s, word processors and personal computers had largely displaced typewriters in most of these uses in the Western world, but as of the 2010s the typewriter is still prominent in many parts of the world, including India.[2]

Video showing the operation of a typewriter
Disassembled parts of an Adler Favorit mechanical typewriter

Notable typewriter manufacturers included E. Remington and Sons, IBM, Imperial Typewriters, Oliver Typewriter Company, Olivetti, Royal Typewriter Company, Smith Corona, Underwood Typewriter Company, Adler Typewriter Company and Olympia Werke.[note 1]


Peter Mitterhofer's typewriter prototype (1864)

Although many modern typewriters have one of several similar designs, their invention was incremental, developed by numerous inventors working independently or in competition with each other over a series of decades. As with the automobile, telephone, and telegraph, a number of people contributed insights and inventions that eventually resulted in ever more commercially successful instruments. Historians have estimated that some form of typewriter was invented 52 times as thinkers tried to come up with a workable design.[3]

Early innovations

Some of the early typing instruments:

John J. Pratt's "pterotype" (1865)

By the mid-19th century, the increasing pace of business communication had created a need for mechanization of the writing process. Stenographers and telegraphers could take down information at rates up to 130 words per minute, whereas a writer with a pen was limited to a maximum of 30 words per minute (the 1853 speed record).[7]

From 1829 to 1870, many printing or typing machines were patented by inventors in Europe and America, but none went into commercial production.

Hansen Writing Ball

Main article: Hansen Writing Ball
Hansen Writing Ball was the first typewriter manufactured commercially (1870)

In 1865, Rev. Rasmus Malling-Hansen of Denmark invented the Hansen Writing Ball, which went into commercial production in 1870 and was the first commercially sold typewriter. It was a success in Europe and was reported as being used in offices in London as late as 1909.[11][12] Malling-Hansen used a solenoid escapement to return the carriage on some of his models which makes him a candidate for the title of inventor of the first "electric" typewriter.

According to the book Hvem er skrivekuglens opfinder? (English: Who is the inventor of the Writing Ball?), written by Malling-Hansen's daughter, Johanne Agerskov, in 1865, Malling-Hansen made a porcelain model of the keyboard of his writing ball and experimented with different placements of the letters to achieve the fastest writing speed. Malling-Hansen placed the letters on short pistons that went directly through the ball and down to the paper. This, together with the placement of the letters so that the fastest writing fingers struck the most frequently used letters, made the Hansen Writing Ball the first typewriter to produce text substantially faster than a person could write by hand.

The Hansen Writing Ball was produced with only upper-case characters. The Writing Ball was used as a template for inventor Frank Haven Hall to create a derivative that would produce letter prints cheaper and faster.[13][14][15]

Malling-Hansen developed his typewriter further through the 1870s and 1880s and made many improvements, but the writing head remained the same. On the first model of the writing ball from 1870, the paper was attached to a cylinder inside a wooden box. In 1874, the cylinder was replaced by a carriage, moving beneath the writing head. Then, in 1875, the well-known "tall model" was patented, which was the first of the writing balls that worked without electricity. Malling-Hansen attended the world exhibitions in Vienna in 1873 and Paris in 1878 and he received the first-prize for his invention at both exhibitions.[16][17][18]

Sholes and Glidden Type-writer

Prototype of the Sholes and Glidden typewriter, the first commercially successful typewriter, and the first with a QWERTY keyboard (1873)

The first typewriter to be commercially successful was invented in 1868 by Americans Christopher Latham Sholes, Frank Haven Hall, Carlos Glidden and Samuel W. Soule in Milwaukee, Wisconsin, although Sholes soon disowned the machine and refused to use, or even to recommend it. It looked "like something like a cross between a piano and a kitchen table."[19] The working prototype was made by the machinist Matthias Schwalbach.[20][21][22] The patent (US 79,265) was sold for $12,000 to Densmore and Yost, who made an agreement with E. Remington and Sons (then famous as a manufacturer of sewing machines) to commercialize the machine as the Sholes and Glidden Type-Writer.

This was the origin of the term typewriter. Remington began production of its first typewriter on March 1, 1873, in Ilion, New York. It had a QWERTY keyboard layout, which because of the machine's success, was slowly adopted by other typewriter manufacturers. As with most other early typewriters, because the typebars strike upwards, the typist could not see the characters as they were typed.


By about 1910, the "manual" or "mechanical" typewriter had reached a somewhat standardized design. There were minor variations from one manufacturer to another, but most typewriters followed the concept that each key was attached to a typebar that had the corresponding letter molded, in reverse, into its striking head. When a key was struck briskly and firmly, the typebar hit a ribbon (usually made of inked fabric), making a printed mark on the paper wrapped around a cylindrical platen.

The platen was mounted on a carriage that moved left or right, automatically advancing the typing position horizontally after each character was typed. The paper, rolled around the typewriter's platen, was then advanced vertically by the "carriage return" lever (at the far left, or sometimes on the far right) into position for each new line of text. A small bell was struck a few characters before the right hand margin was reached to warn the operator to complete the word and then use the side lever to shift the paper back to the beginning of the next line.[23]


In most of the early typewriters, the typebars struck upward against the paper, pressed against the bottom of the platen, so the typist could not see the text as it was typed. What was typed was not visible until a carriage return caused it to scroll into view. The difficulty with any other arrangement was ensuring the typebars fell back into place reliably when the key was released. This was eventually achieved with various ingenious mechanical designs and so-called "visible typewriters" which used frontstriking, in which the typebars struck forward against the front side of the platen, became standard.

One of the first was the Daugherty Visible, introduced in 1893, which also introduced the four-bank keyboard that became standard, although the Underwood which came out two years later was the first major typewriter with these features.[24][25] However, older "nonvisible" models continued in production to as late as 1915.

Shift key

Comparison of full-keyboard, single-shift, and double-shift typewriters in 1911

A significant innovation was the shift key, introduced with the Remington No. 2 in 1878. This key physically "shifted" either the basket of typebars, in which case the typewriter is described as "basket shift", or the paper-holding carriage, in which case the typewriter is described as "carriage shift". Either mechanism caused a different portion of the typebar to come in contact with the ribbon/platen. The result is that each typebar could type two different characters, cutting the number of keys and typebars in half (and simplifying the internal mechanisms considerably). The obvious use for this was to allow letter keys to type both upper and lower case, but normally the number keys were also duplexed, allowing access to special symbols such as percent (%) and ampersand (&).

Before the shift key, typewriters had to have a separate key and typebar for upper-case letters; in essence, the typewriter had two keyboards, one above the other. With the shift key, manufacturing costs (and therefore purchase price) were greatly reduced, and typist operation was simplified; both factors contributed greatly to mass adoption of the technology. Certain models, such as the Barlet, had a double shift so that each key performed three functions. These little three-row machines were portable and could be used by journalists.

However, because the shift key required more force to push (its mechanism was moving a much larger mass than other keys), and was operated by the little finger (normally the weakest finger on the hand), it was difficult to hold the shift down for more than two or three consecutive strokes. The "shift lock" key (the precursor to the modern caps lock) allowed the shift operation to be maintained indefinitely.

Tab key

To facilitate typewriter use in business settings, a tab (tabulator) key was added in the late nineteenth century. Before using the key, the operator had to set mechanical "tab stops", pre-designated locations to which the carriage would advance when the tab key was pressed. This facilitated the typing of columns of numbers, freeing the operator from the need to manually position the carriage. The first models had one tab stop and one tab key; later ones allowed as many stops as desired, and sometimes had multiple tab keys, each of which moved the carriage a different number of spaces ahead of the decimal point (the tab stop), to facilitate the typing of columns with numbers of different length ($1.00, $10.00, $100.00, etc.)

Character sizes

In English-speaking countries, the commonplace typewriters printing fixed-width characters were standardized to print six horizontal lines per vertical inch, and had either of two variants of character width, called "pica" for ten characters per horizontal inch and "elite" for twelve. This differed from the use of these terms in printing, where they refer to the height of the characters on the page ("pica" designating ten horizontal lines per vertical inch).

Some typewriters were designed to print extra large type (commonly double height, double width) for labelling purposes. Classification numbers on books in libraries could be done this way.


Some ribbons were inked in black and red stripes, each being half the width and running the entire length of the ribbon. A lever on most machines allowed switching between colors, which was useful for bookkeeping entries where negative amounts were highlighted in red. The red color was also used on some selected characters in running text, for emphasis. When a typewriter had this facility, it could still be fitted with a solid black ribbon; the lever was then used to switch to fresh ribbon when the first stripe ran out of ink. Some typewriters also had a third position which stopped the ribbon being struck at all. This enabled the keys to hit the paper unobstructed, and was used for cutting stencils for stencil duplicators (aka mimeograph machines).[26]

"Noiseless" designs

In the early part of the 20th century, a typewriter was marketed under the name "Noiseless" and advertised as "silent." It was developed by Wellington Parker Kidder and the first model was marketed by the Noiseless Typewriter Company in 1917. An agreement with Remington in 1924 saw production transferred to Remington, and a further agreement in 1929 allowed Underwood to produce it as well.[27] Noiseless portables sold well in the 1930s and 1940s, and noiseless standards continued to be manufactured until the 1960s.[28]

In a conventional typewriter the typebar reaches the end of its travel simply by striking the ribbon and paper. A "noiseless" typewriter has a complex lever mechanism that decelerates the typebar mechanically before pressing it against the ribbon and paper[27] in an attempt to dampen the noise. It certainly reduced the high-frequency content of the sound, rendering it more of a "clunk" than a "clack" and arguably less intrusive, but such advertising claims as "A machine that can be operated a few feet away from your desk — And not be heard" were not true.

Electric designs

Although electric typewriters would not achieve widespread popularity until nearly a century later, the basic groundwork for the electric typewriter was laid by the Universal Stock Ticker, invented by Thomas Edison in 1870. This device remotely printed letters and numbers on a stream of paper tape from input generated by a specially designed typewriter at the other end of a telegraph line.

Early electric models

The first electric typewriter was produced by the Blickensderfer Manufacturing Company, of Stamford, Connecticut, in 1902. Like the manual Blickensderfer typewriters, it used a cylindrical typewheel rather than individual typebars. It was not a commercial success, which may have been because at the time electricity had not been standardized and voltage differed from city to city. The next step in the development of the electric typewriter came in 1910, when Charles and Howard Krum filed a patent for the first practical teletypewriter.[29] The Krums' machine, named the Morkrum Printing Telegraph, used a typewheel rather than individual typebars. This machine was used for the first commercial teletypewriter system on Postal Telegraph Company lines between Boston and New York City in 1910.[30]

The first Olympia typewriter was invented in 1903, but the first successful Olympia model, the Model 3, was released in 1923.[31] Olympia typewriters were most successful in Germany, the country of invention, but between 1950 and 1970, manufacturing facilities were opening in Canada, Ireland, Mexico, and Chile. The Olympia portable typewriters were the most popular out of all the different models that Olympia produced. Olympia typewriters were known for their "craftsmanship, eye-catching design, and continuous innovation."[32] Some of the Olympia typewriter’s novel features were individually spring-loaded keys, which provided extra comfort and cushioning; different colors like caramel, mint aquamarine, and pink; and script-typing options. There was even a one-handed version of an Olympia typewriter, the Model 8, for disabled users.[32]

James Fields Smathers of Kansas City invented what is considered the first practical power-operated typewriter in 1914. In 1920, after returning from Army service, he produced a successful model and in 1923 turned it over to the Northeast Electric Company of Rochester for development. Northeast was interested in finding new markets for their electric motors and developed Smathers's design so that it could be marketed to typewriter manufacturers, and from 1925 Remington Electric typewriters were produced powered by Northeast's motors.

After some 2,500 electric typewriters had been produced, Northeast asked Remington for a firm contract for the next batch. However, Remington was engaged in merger talks which would eventually result in the creation of Remington Rand and no executives were willing to commit to a firm order. Northeast instead decided to enter the typewriter business for itself, and in 1929 produced the first Electromatic Typewriter.

In 1928, Delco, a division of General Motors, purchased Northeast Electric, and the typewriter business was spun off as Electromatic Typewriters, Inc. In 1933, Electromatic was acquired by IBM, which then spent 1 million USD on a redesign of the Electromatic Typewriter, launching the IBM Electric Typewriter Model 01[33] in 1935. By 1958 IBM was deriving 8% of its revenue from the sale of electric typewriters.

In 1931, an electric typewriter was introduced by Varityper Corporation. It was called the Varityper, because a narrow cylinder-like wheel could be replaced to change the font.[34]

Electrical typewriter designs removed the direct mechanical connection between the keys and the element that struck the paper. Not to be confused with later electronic typewriters, electric typewriters contained only a single electrical component: the motor. Where the keystroke had previously moved a typebar directly, now it engaged mechanical linkages that directed mechanical power from the motor into the typebar.

In 1941, IBM announced the Electromatic Model 04 electric typewriter, featuring the revolutionary concept of proportional spacing. By assigning varied rather than uniform spacing to different sized characters, the Type 4 recreated the appearance of a printed page, an effect that was further enhanced by a typewriter ribbon innovation that produced clearer, sharper words on the page. The proportional spacing feature became a staple of the IBM Executive series typewriters.

IBM Selectric

IBM Selectric II (dual Latin/Hebrew typeball and keyboard)
Selectric II dual Latin/Hebrew Hadar typeball
Replaceable IBM typeballs with clip, €2 coin for scale

IBM and Remington Rand electric typewriters were the leading models until IBM introduced the IBM Selectric typewriter in 1961, which replaced the typebars with a spherical element (or typeball) slightly smaller than a golf ball, with reverse-image letters molded into its surface. The Selectric used a system of latches, metal tapes, and pulleys driven by an electric motor to rotate the ball into the correct position and then strike it against the ribbon and platen. The typeball moved laterally in front of the paper, instead of the previous designs using a platen-carrying carriage moving the paper across a stationary print position.

Due to the physical similarity, the typeball was sometimes referred to as a "golfball". The typeball design had many advantages, especially the elimination of "jams" (when more than one key was struck at once and the typebars became entangled) and in the ability to change the typeball, allowing multiple fonts to be used in a single document.

The IBM Selectric became a commercial success, dominating the office typewriter market for at least two decades. IBM also gained an advantage by marketing more heavily to schools than did Remington, with the idea that students who learned to type on a Selectric would later choose IBM typewriters over the competition in the workplace as businesses replaced their old manual models. By the 1970s, IBM had succeeded in establishing the Selectric as the de facto standard typewriter in mid- to high-end office environments, replacing the raucous "clack" of older typebar machines with the quieter sound of gyrating typeballs.

Later models of IBM Executives and Selectrics replaced inked fabric ribbons with "carbon film" ribbons that had a dry black or colored powder on a clear plastic tape. These could be used only once, but later models used a cartridge that was simple to replace. A side effect of this technology was that the text typed on the machine could be easily read from the used ribbon, raising issues where the machines were used for preparing classified documents (ribbons had to be accounted for to ensure that typists did not carry them from the facility).[35]

Composer output showing Roman, Bold and Italic fonts available by changing the type ball

A variation known as "Correcting Selectrics" introduced a correction feature, where a sticky tape in front of the carbon film ribbon could remove the black-powdered image of a typed character, eliminating the need for little bottles of white dab-on correction fluid and for hard erasers that could tear the paper. These machines also introduced selectable "pitch" so that the typewriter could be switched between pica type (10 characters per inch) and elite type (12 per inch), even within one document. Even so, all Selectrics were monospaced—each character and letterspace was allotted the same width on the page, from a capital "W" to a period. Although IBM had produced a successful typebar-based machine with five levels of proportional spacing, called the IBM Executive,[36] proportional spacing was not provided with the Selectric typewriter or its successors the Selectric II and Selectric III.

The only fully electromechanical Selectric Typewriter with fully proportional spacing and which used a Selectric type element was the expensive Selectric Composer, which was capable of right-margin justification and was considered a typesetting machine rather than a typewriter.

In addition to its electronic successors, the Magnetic Tape Selectric Composer (MT/SC), the Mag Card Selectric Composer, and the Electronic Selectric Composer, IBM also made electronic typewriters with proportional spacing using the Selectric element that were considered typewriters or word processors instead of typesetting machines.

The first of these was the relatively obscure Mag Card Executive, which used 88-character elements. Later, some of the same typestyles used for it were used on the 96-character elements used on the IBM Electronic Typewriter 50 and the later models 65 and 85.

By 1970, as offset printing began to replace letterpress printing, the Composer would be adapted as the output unit for a typesetting system. The system included a computer-driven input station to capture the key strokes on magnetic tape and insert the operator's format commands, and a Composer unit to read the tape and produce the formatted text for photo reproduction.


The IBM 2741 terminal was a popular example of a Selectric-based computer terminal, and similar mechanisms were employed as the console devices for many IBM System/360 computers. These mechanisms used "ruggedized" designs compared to those in standard office typewriters.

Later electric models

Smith-Corona Prestige Auto 12 typing
A recording of the sound of typing on a Smith-Corona electric typewriter.

Problems playing this file? See media help.

Some of IBM's advances were later adopted in less expensive machines from competitors. For example, Smith-Corona electric typewriters of the 1970s used interchangeable ribbon cartridges, including fabric, film, erasing, and two-color versions. At about the same time, the advent of photocopying meant that carbon copies and erasers were less and less necessary; only the original need be typed, and photocopies made from it.

Typewriter/printer hybrids

Towards the end of the commercial popularity of typewriters in the 1970s, a number of hybrid designs combining features of printers were introduced. These often incorporated keyboards from existing models of typewriters and printing mechanisms of dot-matrix printers. The generation of teleprinters with impact pin-based printing engines was not adequate for the demanding quality required for typed output, and alternative thermal transfer technologies used in thermal label printers had become technically feasible for typewriters.

IBM produced a series of typewriters called Thermotronic with letter-quality output and correcting tape along with printers tagged Quietwriter. Brother extended the life of their typewriter product line with similar products. The development of these proprietary printing engines provided the vendors with exclusive markets in consumable ribbons and the ability to use standardized printing engines with varying degrees of electronic and software sophistication to develop product lines. Although these changes reduced prices—and greatly increased the convenience—of typewriters, the technological disruption posed by word processors left these improvements with only a short-term low-end market. To extend the life of these products, many examples were provided with communication ports to connect them to computers as printers.

Electronic typewriters

The final major development of the typewriter was the "electronic" typewriter. Most of these replaced the typeball with a plastic or metal daisy wheel mechanism (a disk with the letters molded on the outside edge of the "petals"). The daisy wheel concept first emerged in printers developed by Diablo Systems in the 1970s. In 1981, Xerox Corporation, who by then had bought Diablo Systems, introduced a line of Electronic Typewriters incorporating this technology (the Memorywriter product line). For a time, these products were quite successful as their daisy-wheel mechanism was much simpler and cheaper than either typebar or Selectric mechanisms, and their electronic memory and display allowed the user to easily see errors and correct them before they were actually printed. One problem with the plastic daisy wheel was that they were not always durable. To solve this problem, more durable metal daisy wheels were made available (but at a slightly higher price).

These and similar electronic typewriters were in essence dedicated word processors with either single-line LCD displays or multi-line CRT displays, built-in line editors in ROM, a spelling and grammar checker, a few kilobytes of internal RAM and optional cartridge, magnetic card or diskette external memory-storage devices for storing text and even document formats. Text could be entered a line or paragraph at a time and edited using the display and built-in software tools before being committed to paper.

Unlike the Selectrics and earlier models, these really were "electronic" and relied on integrated circuits and multiple electromechanical components. These typewriters were sometimes called display typewriters,[37] dedicated word processors or word-processing typewriters, though the latter term was also frequently applied to less sophisticated machines that featured only a tiny, sometimes just single-row display. Sophisticated models were also called word processors, though today that term almost always denotes a type of software program. Manufacturers of such machines included Brother (Brother WP1 and WP500 etc., where WP stood for word processor), Canon (Canon Cat), Smith-Corona (PWP, i.e. Personal Word Processor line)[38] and Philips/Magnavox (VideoWriter).

End of an era

The 1970s and early 1980s were a time of transition for typewriters and word processors. At one point in time, most small-business offices would be completely 'old-style', while large corporations and government departments would already be 'new-style'; other offices would have a mixture. The pace of change was so rapid that it was common for clerical staff to have to learn several new systems, one after the other, in just a few years. While such rapid change is commonplace today, and is taken for granted, this was not always so; in fact, typewriting technology changed very little in its first 80 or 90 years.

Due to falling sales, IBM sold its typewriter division in 1991 to Lexmark, completely exiting from a market it once dominated.

The increasing dominance of personal computers, desktop publishing, the introduction of low-cost, truly high-quality laser and inkjet printer technologies, and the pervasive use of web publishing, e-mail and other electronic communication techniques have largely replaced typewriters in the United States. Still, as of 2009, typewriters continued to be used by a number of government agencies and other institutions in the USA, where they are primarily used to fill preprinted forms. According to a Boston typewriter repairman quoted by The Boston Globe, "Every maternity ward has a typewriter, as well as funeral homes".[39] A fairly major typewriter user is the City of New York, which in 2008 purchased several thousand typewriters, mostly for use by the New York Police Department, at the total cost of $982,269. Another $99,570 was spent in 2009 for the maintenance of the existing typewriters. New York police officers would use the machines to type property and evidence vouchers on carbon paper forms.[40]

A rather specialized market for typewriters exists due to the regulations of many correctional systems in the USA, where prisoners are prohibited from having computers or telecommunication equipment, but are allowed to own typewriters. The Swintec corporation (headquartered in Moonachie, New Jersey), which, as of 2011, still produced typewriters at its overseas factories (in Japan, Indonesia, and/or Malaysia), manufactures a variety of typewriters for use in prisons, made of clear plastic (to make it harder for prisoners to hide prohibited items inside it). As of 2011, the company had contracts with prisons in 43 US states.[41][42]

In April 2011, Godrej and Boyce, a Mumbai-based manufacturer of mechanical typewriters, closed its doors, leading to a flurry of erroneous news reports that the "world's last typewriter factory" had shut down.[43] The reports were quickly debunked.[44][45][46][47]

In November 2012, Brother's UK factory manufactured what it claimed to be the last typewriter ever made in the UK; the typewriter was donated to the London Science Museum.[48]

Russian typewriters use Cyrillic, which has made the ongoing Azerbaijani reconversion from Cyrillic to Roman alphabet more difficult. In 1997, the government of Turkey offered to donate western typewriters to the Republic of Azerbaijan in exchange for more zealous and exclusive promotion of the Roman alphabet for the Azerbaijani language; this offer, however, was declined.

In Latin America and Africa, mechanical typewriters are still common because they can be used without electrical power. In Latin America, the typewriters used are most often Brazilian models – Brazil continues to produce mechanical (Facit) and electronic (Olivetti) typewriters to the present day.[49]

The 21st century has seen a revival of interest in typewriters among certain subcultures, including makers, steampunks, hipsters, and street poets.[50]

Correction technologies

An old typewriter on display at the Historic Archive and Museum of Mining in Pachuca, Mexico

According to the standards taught in secretarial schools in the mid-20th century, a business letter was supposed to have no mistakes and no visible corrections. Accuracy was prized as much as speed. Indeed, typing speeds, as scored in proficiency tests and typewriting speed competitions, included a deduction of ten words for every mistake. Corrections were, of course, necessary, and many methods were developed.

In practice, several methods would often be combined. For example, if six extra copies of a letter were needed, the fluid-corrected original would be photocopied, but only for the two recipients getting "c.c."s; the other four copies, the less-important file copies that stayed in various departments at the office, would be cheaper, hand-erased, less-distinct bond paper copies or even "flimsies" of different colors (tissue papers interleaved with black carbon paper) that were all typed as a "carbon pack" at the same time as the original.

In informal applications such as personal letters where low priority was placed on the appearance of the document, or conversely in highly formal applications in which it was important that any corrections be obvious, the backspace key could be used to back up over the error and then overstrike it with hyphens, slashes, Xs, or the like.

Typewriter erasers

Triumph typewriter eraser (1960)

The traditional erasing method involved the use of a special typewriter eraser made of hard rubber that contained an abrasive material. Some were thin, flat disks, pink or gray, approximately 2 inches (51 mm) in diameter by ⅛ inch (3.2 mm) thick, with a brush attached from the center, while others looked like pink pencils, with a sharpenable eraser at the "lead" end and a stiff nylon brush at the other end. Either way, these tools made possible erasure of individual typed letters. Business letters were typed on heavyweight, high-rag-content bond paper, not merely to provide a luxurious appearance, but also to stand up to erasure.

Typewriter eraser brushes were necessary for clearing eraser crumbs and paper dust, and using the brush properly was an important element of typewriting skill; if erasure detritus fell into the typewriter, a small buildup could cause the typebars to jam in their narrow supporting grooves.

Eraser shield

Erasing a set of carbon copies was particularly difficult, and called for the use of a device called an eraser shield (a thin stainless-steel rectangle about 2 by 3 inches (51 by 76 mm) with several tiny holes in it) to prevent the pressure of erasing on the upper copies from producing carbon smudges on the lower copies. To correct copies, typists had to go from carbon copy to carbon copy, trying not to get their fingers dirty as they leafed through the carbon papers, and moving and repositioning the eraser shield and eraser for each copy.

Erasable bond

Paper companies produced a special form of typewriter paper called erasable bond (for example, Eaton's Corrasable Bond). This incorporated a thin layer of material that prevented ink from penetrating and was relatively soft and easy to remove from the page. An ordinary soft pencil eraser could quickly produce perfect erasures on this kind of paper. However, the same characteristics that made the paper erasable made the characters subject to smudging due to ordinary friction and deliberate alteration after the fact, making it unacceptable for business correspondence, contracts, or any archival use.

Correction fluid

Main article: Correction fluid

In the 1950s and 1960s, correction fluid made its appearance, under brand names such as Liquid Paper, Wite-Out and Tipp-Ex; it was invented by Bette Nesmith Graham. Correction fluid was a kind of opaque, white, fast-drying paint that produced a fresh white surface onto which, when dry, a correction could be retyped. However, when held to the light, the covered-up characters were visible, as was the patch of dry correction fluid (which was never perfectly flat, and frequently not a perfect match for the color, texture, and luster of the surrounding paper). The standard trick for solving this problem was photocopying the corrected page, but this was possible only with high quality photocopiers.

A different fluid was available for correcting stencils. It sealed up the stencil ready for retyping but did not attempt to color match.[51]

Dry correction

Dry correction products (such as correction paper) under brand names such as "Ko-Rec-Type" were introduced in the 1970s and functioned like white carbon paper. A strip of the product was placed over the letters needing correction, and the incorrect letters were retyped, causing the black character to be overstruck with a white overcoat. Similar material was soon incorporated in carbon-film electric typewriter ribbons; like the traditional two-color black-and-red inked ribbon common on manual typewriters, a black and white correcting ribbon became commonplace on electric typewriters. But the black or white coating could be partly rubbed off with handling, so such corrections were generally not acceptable in legal documents.

The pinnacle of this kind of technology was the IBM Electronic Typewriter series. These machines, and similar products from other manufacturers, used a separate correction ribbon and a character memory. With a single keystroke, the typewriter was capable of automatically backspacing and then overstriking the previous characters with minimal marring of the paper. White cover-up ribbons were used with fabric ink ribbons, or an alternate premium design featured plastic lift-off correction ribbons which were used with carbon film typing ribbons. This latter technology actually lifted the carbon film forming a typed letter, leaving nothing more than a flattened depression in the surface of the paper, with the advantage that no color matching of the paper was needed.


Keyboard layouts

The "QWERTY" layout of typewriter keys became a de facto standard and continues to be used long after the reasons for its adoption (including reduction of key/lever entanglements) have ceased to apply.


The 1874 Sholes & Glidden typewriters established the "QWERTY" layout for the letter keys. During the period in which Sholes and his colleagues were experimenting with this invention, other keyboard arrangements were apparently tried, but these are poorly documented.[52] The QWERTY layout of keys has become the de facto standard for English-language typewriter and computer keyboards. Other languages written in the Latin alphabet sometimes use variants of the QWERTY layouts, such as the French AZERTY, the Italian QZERTY and the German QWERTZ layouts.

The QWERTY layout is not the most efficient layout possible for the English language, since it requires a touch-typist to move his or her fingers between rows to type the most common letters. Although the QWERTY keyboard was the most commonly used layout in typewriters, a better, less strenuous keyboard was being searched for throughout the late 1900s.[53]

One popular but widely debunked[54] explanation for the QWERTY arrangement is that it was designed to reduce the likelihood of internal clashing of typebars by placing commonly used combinations of letters farther from each other inside the machine.[55][56]

Another story is that the QWERTY layout allowed early typewriter salesmen to impress their customers by being able to easily type out the example word "typewriter" without having learned the full keyboard layout , because "typewriter" can be spelled purely on the top row of the keyboard. However, there is no evidence to support these claims.

Other layouts

A number of radically different layouts such as Dvorak have been proposed to reduce the perceived inefficiencies of QWERTY, but none have been able to displace the QWERTY layout; their proponents claim considerable advantages, but so far none has been widely used. The Blickensderfer typewriter with its DHIATENSOR layout may have possibly been the first attempt at optimizing the keyboard layout for efficiency advantages.[57]

Many non-Latin alphabets have keyboard layouts that have nothing to do with QWERTY. The Russian layout, for instance, puts the common trigrams ыва, про, and ить on adjacent keys so that they can be typed by rolling the fingers. The Greek layout, on the other hand, is a variant of QWERTY.

Typewriters were also made for East Asian languages with thousands of characters, such as Chinese or Japanese. They were not easy to operate, but professional typists used them for a long time until the development of electronic word processors and laser printers in the 1980s (See the gallery at the end of this article for pictures of East Asian mechanical typewriters).

On modern keyboards, the exclamation point is the shifted character on the 1 key, a direct result of the historical fact that these were the last characters to become "standard" on keyboards. Holding the spacebar pressed down usually suspended the carriage advance mechanism (a so-called "dead key" feature), allowing one to superimpose multiple keystrikes on a single location. The ¢ symbol (meaning cents) was located above the number 6 on electric typewriters, while ASCII computer keyboards have ^ instead.

Typewriter conventions

This typed page uses a number of typographic conventions stemming from the mechanical limitations of the typewriter: two hyphens in place of an em dash, double sentence spacing, straight quotation marks, tab indents for paragraphs, and double carriage returns between paragraphs

A number of typographical conventions originate from the widespread use of the typewriter, based on the characteristics and limitations of the typewriter itself. For example, the QWERTY keyboard typewriter did not include keys for the en dash and the em dash. To overcome this limitation, users typically typed more than one adjacent hyphen to approximate these symbols. This typewriter convention is still sometimes used today, even though modern computer word processing applications can input the correct en and em dashes for each font type.[58]

Other examples of typewriter practices that are sometimes still used in desktop publishing systems include inserting a double space at the end of a sentence,[59][60] and the use of straight quotes (or "dumb quotes") as quotation marks and prime marks.[61] The practice of underlining text in place of italics and the use of all capitals to provide emphasis are additional examples of typographical conventions that derived from the limitations of the typewriter keyboard that still carry on today.[62]

Many older typewriters did not include a separate key for the numeral 1 or the exclamation point, and some even older ones also lacked the numeral zero. Typists who trained on these machines learned the habit of using the lowercase letter l ("ell") for the digit 1, and the uppercase O for the zero. A cents symbol (¢) was created by combining (over-striking) a lower case 'c' with a slash character (typing 'c', then backspace, then '/').

Similarly, the exclamation point was created by combining an apostrophe and a period.[63] These characters were omitted to simplify design and reduce manufacturing and maintenance costs; they were chosen specifically because they were "redundant" and could be recreated using other keys.

Computer jargon

Some terminology from the typewriter age has survived into the personal computer era. Examples include:

In the above listing, the two-letter codes in parentheses are abbreviations for the ASCII characters derived from typewriter usage.

Early social effects

Humorous "Get out! Can't you see I'm busy" postcard (1900s)

When Remington started marketing typewriters, the company assumed the machine would not be used for composing but for transcribing dictation, and that the person typing would be a woman. The 1800s Sholes and Glidden typewriter had floral ornamentation on the case.[64]

During World War I and II, increasing numbers of women were entering the workforce. In the United States, women often started in the professional workplace as typists. Questions about morals made a salacious businessman making sexual advances to a female typist into a cliché of office life, appearing in vaudeville and movies. Being a typist was considered the right choice for a "good girl" meaning women who present themselves as being chaste and having good conduct.[65] According to the 1900 census, 94.9 percent of stenographers and typists were unmarried women.[66]

The "Tijuana bibles" — adult comic books produced in Mexico for the American market, starting in the 1930s — often featured women typists. In one panel, a businessman in a three-piece suit, ogling his secretary’s thigh, says, "Miss Higby, are you ready for—ahem!—er—dictation?"[28]

Authors and writers who had notable relationships with typewriters

Early adopters


William Faulkner's Underwood Universal Portable sits in his office at Rowan Oak, which is now maintained by the University of Mississippi in Oxford as a museum.

Late users

In music


Forensic examination

Typewritten documents may be examined by forensic document examiners. This is done primarily to determine 1) the make and/or model of the typewriter used to produce a document, or 2) whether or not a particular suspect typewriter might have been used to produce a document.[80] In some situations, an ink or correction ribbon may also be examined.

The determination of a make and/or model of typewriter is a 'classification' problem and several systems have been developed for this purpose.[80] These include the original Haas Typewriter Atlases (Pica version)[81] and (Non-Pica version)[82] and the TYPE system developed by Dr. Philip Bouffard,[83] the Royal Canadian Mounted Police's Termatrex Typewriter classification system,[84] and the Interpol's Typewriter classification system,[85] among others.[80]

Because of the tolerances of the mechanical parts, slight variation in the alignment of the letters and their uneven wear, each typewriter has an individual "signature" or "fingerprint", which may permit a typewritten document to be traced back to the typewriter on which it was produced. For devices utilizing replaceable components, such as a typeball element, any association may be restricted to a specific element, rather than to the typewriter as a whole.

The earliest reference in fictional literature to the potential identification of a typewriter as having produced a document was by Sir Arthur Conan Doyle who wrote "A Case of Identity" in 1891.[86] In non-fiction, the first document examiner[86] to describe how a typewriter might be identified was William E. Hagan who wrote, in 1894, "All typewriter machines, even when using the same kind of type, become more or less peculiar by use as to the work done by them".[87] Other early discussions of the topic were provided by A. S. Osborn in his 1908 treatise, Typewriting as Evidence,[88] and again in his 1929 textbook, Questioned Documents.[89] A modern description of the examination procedure is laid out in ASTM Standard E2494-08 (Standard Guide for Examination of Typewritten Items).[90]

Typewriter examination was used in the Leopold and Loeb and Alger Hiss cases. In the Eastern Bloc, typewriters (together with printing presses, copy machines, and later computer printers) were a controlled technology, with secret police in charge of maintaining files of the typewriters and their owners. In the Soviet Union, the First Department of each organization sent data on organization's typewriters to the KGB. This posed a significant risk for dissidents and samizdat authors. In Romania, according to State Council Decree No. 98 of March 28, 1983, owning a typewriter, both by businesses or by private persons, was subject to an approval given by the local police authorities.[91] People previously convicted of any crime or those who because of their behaviour were considered to be "a danger to public order or to the security of the state" were refused approval.[91] In addition, once a year, typewriter owners had to take the typewriter to the local police station, where they would be asked to type down a sample of all the typewriter's characters.[91] It was also forbidden to borrow, lend, or repair typewriters other than at the places that had been authorized by the police.[91]

The ribbon can be read vertically, although only if it has not been typed over more than once. This can be very hard to do as it does not include spaces, but can be done, giving even a typewriter a "memory".

See also


  1. Article about Olympia Werke is available only in German Wikipedia.


  1. "typewriter (2)". Oxford English Dictionary. Vol 18 (2nd ed.). Oxford University Press. 1989. p. 789.
  2. Mark Magnier (September 1, 2011). "Typewriter lives on in India". Los Angeles Times. latimes.com. Retrieved 12 September 2013.
  3. Acocella, Joan (April 9, 2007). "The Typing Life: How writers used to write". The New Yorker.
  4. "Henry Mill Patents". Todayinsci.com. Retrieved 2012-03-30.
  5. "History of Computers and Computing, Birth of the modern computer, The bases of digital computers, typewriter and computer keyboard". history-computer.com. Retrieved 2016-09-19.
  6. William Austin Burt's Typographer. Science Museum. 1829.
  7. Utterback, James M. Utterback (1996). Mastering The Dynamics Of Innovation, 2nd Ed. Harvard Business Press. ISBN 0875847404.
  8. "Type Writing Machine.". Scientific American. New. 17 (1). New York. 1867-07-06. p. 3. Retrieved 2009-01-14.
  9. ''Popular Mechanics'', May 1929, pg. 751. Books.google.com. Retrieved 2012-03-30.
  10. "Trade Notes". The Aluminum World. New York. 11 (9): 183. June 1896. Retrieved 2015-12-18.
  11. Mares, G. C. (1909). The History of the Typewriter. London. p. 230.
  12. "Early Office Museum". Retrieved 1 December 2013.
  13. Larson, Erik. A Devil in the White City: Murder, Magic, and Madness at the Fair that Changed America. New York: Vintage Books, a Division of Random House, Inc. p. 291 (Adobe epub book).
  14. Hendrickson, Walter B. (1956). "The Three Lives of Frank H. Hall" (PDF). Journal of Illinois State Historical Society. University of Illinois Press. 49 (3).
  15. Anonymous (24 April 2011). "Hall Braille Writer". American Printing House for the Blind, Inc. Retrieved 29 February 2012.
  16. Otto Burghagen (1898). Die Schreibmaschine. Illustrierte Beschreibung aller gangbaren Schreibmaschinen nebst gründlicher Anleitung zum Arbeiten auf sämtlichen Systemen.
  17. Dieter Eberwein,. Nietzsches Schreibkugel. Ein Blick auf Nietzsches Schreibmaschinenzeit durch die Restauration der Schreibkugel. Eberwein-Typoskriptverlag. Schauenburg 2005.
  18. Johanne Agerskov (1925). Hvem er Skrivekuglens Opfinder?.
  19. Jocher, Katharine. "The Typewriter and the Men Who Made It (Book Review)." Social Forces. 33.1 (1954): 197-198. HeinOnline. Web. 12 Oct. 2015.
  20. The History of the Typewriter - Smart Beard
  21. Schwalbach Tower Clocks, Vintagecatalogs.com
  22. Wisconsin Historical Commission, Waymarking.com
  23. "The Remington Type-Writing Machine" (PDF). Nature (14.342): 43–44. 1876. Retrieved 9 October 2015. (subscription required (help)).
  24. Robert, Paul. "Daugherty". Collection. The Virtual Typewriter Museum. Retrieved July 5, 2012. External link in |publisher= (help)
  25. Seaver, Alan (2011). "Daugherty Visible". Machines of Loving Grace website. Alan Seaver. Archived from the original on May 11, 2013. Retrieved July 5, 2012. External link in |work= (help)
  26. "How to prepare a mimeograph stencil by using a typewriter". LinguaLinks Library. SIL International. Retrieved 2011-05-10.
  27. 1 2 OOcities.com Reproduction of advertisement for Noiseless typewriters, with list of models and diagram of typebar mechanism
  28. 1 2 3 4 Newyorker.com Acocella, Joan, "The Typing Life: How writers used to write", The New Yorker, April 9, 2007, a review of The Iron Whim: A Fragmented History of Typewriting (Cornell) 2007, by Darren Wershler-Henry
  29. "U.S. Patent 1,286,351 filed in May, 1910, and issued in December, 1918". Retrieved 2011-09-16.
  30. Colin Hempstead, William E. Worthington (2005). Encyclopedia of 20th Century Technology. p. 605. ISBN 978-1-57958-464-1.
  31. Ferguson, Eugene S. "Contributions to Bibliography in the History of Technology (Part VII)." Technology and Culture. 6.1 (1965): 99-107. JSTOR. Web. 13 Oct. 2015.
  32. 1 2 The History of Olympia Typewriters: A German Original. Vintage Typewriter Jewelry. n.d. Web. 9 Oct. 2015. http://www.vintagetypewriterjewelry.com
  33. "IBM Electric Typewriter Model 01". 03.ibm.com. Retrieved 2013-09-12.
  34. "Changing the Type of Typewriter Made Easy". Popular Mechanics. July 1931. Retrieved 2012-03-30.
  35. Ellen, David (2005). Scientific Examination of Documents. CRC Press. pp. 106–107. ISBN 0-8493-3925-1.
  36. Wershler-Henry, Darren (2005). The Iron Whim: A Fragmented History of Typewriting. Ithica and London: Cornell University Press. p. 254. ISBN 978-0-8014-4586-6.
  37. US patent 4620808, "Display typewriter", issued 1986-11-04
  38. "Smith-Corona". Mindmachine.co.uk. Retrieved 2013-09-12.
  39. Keene, Cindy Atoji (2009-02-01). "Typewriters ring on in the fringes". The Boston Globe.
  40. Typewrite & Wrong: NYPD 'Wastes' $1M on Relics, By Jeremy Olshan, New York Post, July 13, 2009
  41. "The death of the typewriter? Don't write it off yet". Radio Netherlands Worldwide. 2011-04-27. Retrieved 2012-03-30.
  42. "Texas inmates have clear choice in typewriters". Fixed-mobile-convergence.tmcnet.com. 2011-06-15. Retrieved 2012-03-30.
  43. CBC News (April 26, 2011). "World's last typewriter plant stops production". Retrieved April 27, 2011. A previous version of this story did not clearly state that Godrej & Boyce appears to be the world's last maker of mechanical typewriters, which operate solely on human power. Numerous other manufacturers continue to make several types of electric typewriters.
  44. "Wite Out? World's 'last typewriter factory' apparently isn't". Content.usatoday.com. 2011-04-26. Retrieved 2012-03-30.
  45. Romenesko, Jim (2011-04-26). "Reports of typewriter's death are premature". Poynter.org. Retrieved 2012-03-30.
  46. Memmott, Mark (2011-04-26). "Has The Last Typewriter Factory Closed? Not Really". Npr.org. Retrieved 2012-03-30.
  47. Rohrlich, Justin (2011-04-25). "Contrary to Reports, Typewriter Industry "Far From Dead"".
  48. "UK's 'last typewriter' produced". BBC. 2012-11-20. Retrieved 2013-09-12.
  49. "Ainda se fabricam máquinas de escrever? (''Are typewriters still manufactured?'')". Mundoestranho.abril.com.br. Retrieved 2012-03-30.
  50. Richard Polt, The Typewriter Revolution: A Typist's Companion for the 21st Century (Woodstock, VT: Countryman Press, 2015)
  51. "How to correct a mimeograph stencil". LinguaLinks Library. SIL International. Retrieved 2011-05-10.
  52. Liebowitz, S. J.; Stephen E. Margolis (1990). "The Fable of the Keys". Journal of Law & Economics. The University of Chicago. XXXIII (April 1990). doi:10.1086/467198. Retrieved 2008-06-18. This article examines the history, economics, and ergonomics of the typewriter keyboard. We show that David's version of the history of the market's rejection of Dvorak does not report the true history, and we present evidence that the continued use of Qwerty is efficient given the current understanding of keyboard design.
  53. Kroemer, Karl H.E. "Keyboards and keying: An annotated bibliography of the literature from 1878 to 1999." Universal Access in the Information Society. 1.2 (2001): 99-160. Web. 9 Oct. 2015.
  54. Fact of Fiction? The Legend of the QWERTY Keyboard | Arts & Culture | Smithsonian
  55. David, P.A. (1986): Understanding the Economics of QWERTY: the Necessity of History. In: Parker, William N.: Economic History and the Modern Economist. Basil Blackwell, New York and Oxford.
  56. "Consider QWERTY". Archived from the original on May 15, 2008. Retrieved 2008-06-18. QWERTY's effect, by reducing those annoying clashes, was to speed up typing rather than slow it down.
  57. "Instructions for Using the Blickensderfer Typewriter". Retrieved 2014-01-03.
  58. Upper and Lower Case Magazine. "U&lc Online Issue 41.1.1: Top Ten Type Crimes". Retrieved 23 March 2010.
  59. Williams, Robin (2003). The Mac is not a typewriter: A style manual for creating professional-level type on your Macintosh (2nd ed.). Berkeley, CA: Peachpit Press. ISBN 0-201-78263-4.
  60. Felici, James (2003). The Complete Manual of Typography: A Guide to Setting Perfect Type. Berkeley, CA: Peachpit Press. p. 80. ISBN 0-321-12730-7.
  61. Rosendorf, Theodore (2009). The Typographic Desk Reference (1st ed.). New Castle, Delaware. ISBN 978-1-58456-231-3.; Upper and Lower Case Magazine. "U&lc Online Issue 41.1.1: Top Ten Type Crimes". Retrieved 23 March 2010.; Strizver, Ilene (2010). Type Rules: The Designer's Guide to Professional Typography (3rd ed.). New Jersey: John Wiley & Sons. p. 199. ISBN 978-0-470-54251-4.. Strizver states that "When available, true primes should be used for measurements, but typewriter quotes (not smart quotes) have become the accepted practice in digital typography."
  62. Regents of the University of Minnesota (18 July 2007). "University of Minnesota Style Manual". University of Minnesota. Regents of the University of Minnesota. Archived from the original on January 17, 2009. Retrieved 12 May 2010. This topic is discussed under "Creating Professional-looking Text."; Williams 2003. pps. 31, 33. Another example of the limitation of the typewriter in regard to underlining, was the necessity to underline the titles of books and stand-alone works in Bibliographies—works that would otherwise have been italicized, if that capability existed on the typewriter.
  63. Truss, Lynn (2004). Eats, Shoot & Leaves: The Zero Tolerance Approach to Punctuation. New York: Gotham Books. p. 135. ISBN 1-59240-087-6.
  64. "1876 Sholes,Gidden,Soule invention". Retrieved 29 December 2012.
  65. Boyer, Kate, and Kim England. "Gender, Work and Technology in the Information Workplace: From Typewriters to ATMs." Social & Cultural Geography 9.3 (2008): 241-56. Web.
  66. Waller, Robert A.. "WOMEN AND THE TYPEWRITER DURING THE FIRST FIFTY YEARS, 1873-1923". Studies in Popular Culture 9.1 (1986): 39–50. Web.
  67. "The First Typewriter". Rehr, Darryl. Retrieved 2009-02-16.
  68. Carpenter, Humphrey (1978). J. R. R. Tolkien: A Biography, Unwin Paperbacks p.207. ISBN 0 04 928039 2
  69. Foster, Edward H., Richard Brautigan, Twayne 1983.
  70. A Bruin Birthday Tribute To Ray Bradbury Tweet (August 22, 2010). "First Spark: Ray Bradbury Turns 90; The Universe and UCLA Academy Celebrate". Spotlight.ucla.edu. Retrieved September 30, 2011.
  71. "Blog archive".
  72. "Harlan Ellison Webderland: Interview". Harlanellison.com. Retrieved 2012-03-30.
  73. Kennedy, Randy (2009-12-04). "Cormac McCarthy's Typewriter Brings $254,500 at Auction - ArtsBeat Blog - NYTimes.com". Artsbeat.blogs.nytimes.com. Retrieved 2010-01-11.
  74. Patricia Cohen (November 30, 2009). "No Country for Old Typewriters: A Well-Used One Heads to Auction". New York Times.
  75. "Why typewriters beat computers". BBC News. 2008-05-30.
  76. Hurley, Sean. "Boston Orchestra Makes Typewriters Sing". NPR Music. National Public Radio. Retrieved 2012-03-16.
  77. "The Boston Typewriter Orchestra". The Boston Typewriter Orchestra. Wordpress. Retrieved 2012-03-16.
  78. "Becoming Typewriter : Ryu Hankil : Free Download & Streaming : Internet Archive". Archive.org. 2001-03-10. Retrieved 2013-09-12.
  79. "Populaire Bande Annonce Officielle". YouTube. Retrieved 2013-09-12.
  80. 1 2 3 Kelly, Mary W. (2006). "Typewriters". Scientific Examination of Questioned Documents, Second Edition (Forensic and Police Science Series) (2nd ed.). Boca Raton, FL: CRC Press. pp. 177–189. ISBN 978-0849320446
  81. Haas, Josef. (1972), "ATLAS der Schreibmaschinenschrift, PICA".
  82. Haas, Josef and Bernhard Haas. (1985), "ATLAS der Schreibmaschinenschrift, Non-PICA".
  83. Bouffard, P.D. (1992), A PC-Based Typewriter Typestyle Classification System Standard, presented at the American Academy of Forensic Sciences meeting, New Orleans, LA.
  84. Hodgins, Cpl. J.H. (January 1963). "A Punchcard System for Identification of Typescript". Journal of Forensic Science. 8 (1): 68–81.
  85. Interpol (1969) "System for Identification of Typewriter Makes Using the Card Index", ICPO-Interpol
  86. 1 2 Crown, David A. (March 1967). "Landmarks in Typewriting Identification". Journal of Criminal Law, Criminology and Police Sciences. 58 (1): 105–111. JSTOR 1141378. The earliest known reference to the identification potential of typewriting, curiously enough, appears in 'A Case of Identity', a Sherlock Holmes story by Sir Arthur Conan Doyle...
  87. Hagan, William E. (1894). "Chapter VIII". Disputed Handwriting. Albany, NY: Banks & Brothers. p. 203
  88. Osborn, Albert S. (1908). "Typewriting as Evidence". Rochester, NY: The Genesee Press: 23
  89. Osborn, Albert S. (1973) [1929]. "Questioned Typewriting". Questioned Documents (2nd ed.). Montclair, NJ: Patterson Smith. p. 1042. ISBN 0-87585-207-6
  90. ASTM International, These guides are under the jurisdiction of ASTM Committee E30 on Forensic Sciences and the direct responsibility of Subcommittee E30.02 on Questioned Documents. Copies of ASTM Standards can be obtained directly from ASTM International.
  91. 1 2 3 4 Betea, Lavinia (February 13, 2009). "La Miliţie cu maşina de scris" (in Romanian). jurnalul.ro. Retrieved August 24, 2014.


Further reading

Look up typewriter in Wiktionary, the free dictionary.
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