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The IBM 608 Calculator
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IBM dedicates Harvard Mark I, August 7, 1944 - EDN
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IBM 608 Calculator on Behance
File:IBM Automatic Sequence Controlled Calculator Sequence Indicators.jpg - Wikimedia Commons
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IBM Calculators
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IBM Automatic Sequence Controller Calculator (ASCC) | 102656996 | Computer History Museum
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Vintage IBM IP-560 Electronic Desk Business Calculator | eBay
