1940 IBM 402 Computer Programming Board This very rare treasure is an original IBM 402 Accounting Machine Computer Programming Board that dates to the 1940s to 1950s. Programmers of the period would spend hours, days and months wiring card column positions into the IBM 402 computer machine program board to perform a specific task. The IBM 402 Accounting Machine was the most powerful business machine available 60 years ago. - Raggio Photos
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