IBM 604 Calculator with Pluggable Units (1948)
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The IBM 604 Calculator was designed with pluggable circuits and tubes which allowed for easy replacement in the field. The old defective unit could be swapped out for a new one in a relatively short period of time.
History of Computing
An Encyclopedia of the People and Machines that Made Computer History
Copyright © 1982-2000, Lexikon Services "History of Computing" ISBN 0-944601-78-2
