The IBM 402 and IBM 403 Accounting Machines were tabulating machines introduced by International Business Machines in the late 1940s. The 402 could read punched cards at a speed of up to 150 cards per minute, while printing data at a speed of up to 100 lines per minute with 43 alpha-numerical type bars and 45 numerical type bars. The IBM 403 added the ability to print up to three lines—e.g. a multiline shipping address—from a single card, instead of just one line per card with the 402. The 402 and 403 were primarily controlled by a removable control panel. Additional controls included a carriage control tape and mechanical levers called hammersplits and hammerlocks, that controlled some printing functions.
- IBM Accounting Machine: 402, 403 and 419 Principles of Operation (PDF). 1963. 224-5654-13.
- Visit to a working IBM 402 in Conroe, Texas