The Hewlett-Packard 48 series family. : r/calculators
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Hewlett Packard
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The early history of HP calculators | HPE
HP Calculators Purchase and Support | HP® Official Site
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Mathematical Treasure: Hewlett-Packard HP-28S Handheld Electronic Calculator from the AMS Centennial Meeting | Mathematical Association of America
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Vintage Hewlett Packard 45 Scientific Calculator for Collectors - Calculators - BMI Surplus
HP 48 series - Wikipedia
HP 12C Financial Calculator - Office Depot
