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IBM Calculators
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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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![IBM electronic calculator [1951] : r/vintageads](https://i.redd.it/xzl47oy5c4ga1.jpg "IBM electronic calculator [1951] : r/vintageads")
IBM electronic calculator [1951] : r/vintageads
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