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HP-28C/S
Hewlett Packard HP 28S Advanced Scientific Calculator
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HP-28C/S
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HP-28S Advanced Scientific Calculator (Part 1) - YouTube
HP 28S
Hewlett-Packard HP-28S Handheld Electronic Calculator | National Museum of American History
HP 28S - One of the early fully programmable calculators, circa 1988. : r/retrobattlestations
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Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History
Hewlett Packard HP 28S Advanced Scientific Calculator
