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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 (38772251491).jpg - Wikimedia Commons
The HP 45: A "Shift" in Technology - Hewlett-Packard History
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Hewlett-Packard HP-45 Handheld Electronic Calculator | National Museum of American History
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Hewlett-Packard HP-45 Handheld Electronic Calculator | National Museum of American History
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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
The HP 45: A "Shift" in Technology - Hewlett-Packard History
45 45 90 Triangle. Calculator | Formula | Rules
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The HP 45: A "Shift" in Technology - Hewlett-Packard History
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