IBM 402

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An IBM 403 accounting machine with an IBM 514 summary punch, center, attached
IBM 402 control panel wiring. This board was labeled "profit & loss summary."

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.[1]

In July 2010, a group from the Computer History Museum reported that an IBM 402 was still in operation at a filter manufacturing company in Conroe, Texas.[2]

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