TYPEWRITERS : Typewriter is the most common machine used in almost all offices. Typewritten letters are attractive in appearance as compared to handwritten ones. The same matter can be typed in lesser space on writing paper along with carbon copies. Thus, use of a typewriter helps to bring about speed and efficiency in written communication and lab management. Many other advantages such as quick tabulation, storage of data, typing of formulae, etc., may also be obtained by the use of special purpose typewriters.