done bsc from gdc kathua and 12th from kv professional typewriter fore computers, many business processes used typewriters to produce printed documents. A typewriter is a mechanical device to produce printed characters on a piece of paper by typing individual keys. ... They progressed from mechanical typewriters to electric typewriters to electronic typewriters. For a mechanical typewriter, each key is one end of a lever. Depressing the key raises the other end of the lever, and this in turn causes the letter to be pressed against a ribbon containing ink, and the letter and ribbon together being pressed against a piece of paper.