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IBM Calculators
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Oct. 7, 1954: IBM Gets Transistorized | WIRED
The IBM CPC
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IBM Automatic Sequence Controlled Calculator (Mark I), circa 1944 - US Patent and Trademark Office - USA Stock Photo - Alamy
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File:IBM 604 Electronic Calculator (1948).jpg - Wikimedia Commons
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IBM Electronic Calculator Group, 1952 (print) by Unknown photographer, (20th century)
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The IBM 608 Calculator
IBM 632 - Wikipedia
IBM Card-Programmed Electronic Calculator | IT History Society
IBM dedicates Harvard Mark I, August 7, 1944 - EDN
IBM Archives: Card-Programmed Electronic Calculator (CPC)
IBM100 - IBM 603
