HP 45 Scientific Calculator - YouTube
Hewlett-Packard HP-45 Handheld Electronic Calculator | National Museum of American History
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The HP 45: A "Shift" in Technology - Hewlett-Packard History
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
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Hewlett-Packard HP-45 Handheld Electronic Calculator | National Museum of American History
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Eddie's Math and Calculator Blog: Retro Review: Hewlett Packard HP 45
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Texas Instruments 1795 Solar Mini-Desktop Calculator
