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Hewlett-Packard HP-28S Handheld Electronic Calculator | National Museum of American History
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HP-28S Advanced Scientific Calculator
HP 28S Scientific Calculator for sale online | eBay
Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History
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HP 28S
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HP-28S Advanced Scientific Calculator
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HP-28S Advanced programmable Scientific Calculator | X1440.97 | Computer History Museum
HP-28S Advanced Scientific Calculator (Part 1) - YouTube
HP-28 series - Wikipedia
