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The Hewlett-Packard 65, the first pocket programmable calculator, and it's successor(s), the Hewlett-Packard 67 and Hewlett-Packard 97. : r/calculators
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File:Vintage Hewlett-Packard Model HP-97 Magnetic Card-Programmable Handheld Calculator With Thermal Printer, 7-Segment Red LED Display, Cost New = 750 USD, Circa 1976 (14548847987).jpg - Wikimedia Commons
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