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File:Vintage Hewlett-Packard Model HP-16C Progammable RPN Calculator, HP's First and Only Programmable Calculator, Circa 1988 (9330369298).jpg - Wikimedia Commons
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File:Vintage Hewlett-Packard Model HP-45 Advanced Scientific Pocket Calculator, HP's Third Handheld Electronic Calculator, Introduced in 1973 and Discontinued in 1976 (11590594223).jpg - Wikimedia Commons
Hewlett Packard
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