The IBM 608 Calculator
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File:IBM Automatic Sequence Controlled Calculator Sequence Indicators.jpg - Wikimedia Commons
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List of IBM products - Wikipedia
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IBM-CPC (1960)
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Smart technology: How the humble pocket calculator morphed into the smartphone
IBM Naval Ordnance Research Calculator - Wikipedia
Pluggable Units of the IBM 604 calculator
IBM Archives: Card-Programmed Electronic Calculator (CPC)
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IBM Archives: IBM 608 calculator
The IBM 609 Calculator
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IBM Announces the 608 Calculator, the First Solid State Computer : History of Information
The IBM 609 Calculator
IBM 608 Calculator on Behance
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