HP Calcs – HP 10s+ Calculator
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HP calculators - Wikipedia
Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History
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HP calculators - Wikipedia
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The Hewlett Packard Calculator Page
HP 15C Scientific Calculator - Apps on Google Play
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HP-42S Scientific Calculator
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HP reincarnates calculators on iPhone, Windows - CNET
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HP 10s Scientific Calculator (F2214AA#AK6)
The Hewlett Packard Calculator Page
