Type-writing

Atypewriteris amechanicalorelectromechanicaldevice with a set of keys, when pressed, causecharactersto be printed on a medium, usuallypaper. From their invention, typewriters were indispensable tools for many professional writers and in business offices. By the end of the 1980s,word processorsand personal computershad largely replaced the tasks previously accomplished with typewriters. Typewriters, however, remain in use in various areas of the world.

Forensic identification--Identifying the make and model of typewriters is a part ofquestioned document examination. Because of the tolerances of the mechanical parts, slight variation in the alignment of the letters and their uneven wear, each typewriter had its individual "signature" or "fingerprint", allowing a typewritten document to betraced backto the typewriter it was produced on. The ribbon ink could also be analyzed, particularly if a carbon ribbon was used.