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HP-67
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File:HP-67 with Blackbox.jpg - Wikipedia
File:HP-67 calculator with magnetic card in reader.jpg - Wikimedia Commons
calculators\Hewlett-Packard HP 67 - calculator.org
HP-67 Owners Handbook and Programming Guide
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File:Card reader unit from calculator HP-67 with read-write head and roller (cropped).jpg - Wikimedia Commons
Documentation - HP-67 Owner's Handbook and Programming Guide | National Museum of American History
HP-67/-97 - Wikipedia
HP-67 Scientific Calculator Programming Pads 1977 OEM Box HP Hewlett Packard 67 | eBay
