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The HP-65 was the first magnetic card programmable handheld scientific calculator. The Hewlett Packard Corporation introduced it in 1974.
Vintage HP-65 LED Scientific Calculator Programmable + Manual + Case + Pac + Box
Vintage 1990s Hewlett Packard HP 12C Financial Programmable Calculator
Hewlett-Packard HP-65
Product Specifications
HP-65 - Wikipedia
HP-65
DATAMATH
Vintage Radio Shack Programmable Scientific Formula Calculator NIB 65-987
Pocket Calculators and Other Things: Prelude to the Microprocessor
Pin by A T on Calculators Pocket calculators, Computer history, Old computers