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HP 67
HP-67 Owners Handbook and Programming Guide
The HP 67 programmable calculator
HP 67 Calculator Battery Terminal plus/minus
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Vintage 1976 HP 67 Programmable Scientific Calculator Hewlett Packard USA | eBay
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Documentation - HP-67 Owner's Handbook and Programming Guide | National Museum of American History
HP 67 Teenix CPU Board Upgrade to Continuous Memory and More - YouTube
