Calculator, Programmable, HP-65
The HP-65 was the first magnetic card programmable handheld scientific calculator. The Hewlett Packard Corporation introduced it in 1974.
HP-65 Calculator and Related Items
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My grandpa's 1965(ish) HP 21 Calculator : r/BuyItForLife
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HP-65 scientific programmable calculator (1975), en.wikiped…
Hewlett-Packard Journal Vol. 25 No. 9 (1974-05)(Hewlett-Packard) : Free Download, Borrow, and Streaming : Internet Archive
HP Is Selling a 40-Year-Old Calculator Again—For $120
Calculator, Programmable, HP-65
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HP 65 Calculator, mercycube
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Hewlett-Packard HP 19C/29C Combo Programmable Calculator FW, 90DW
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