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Calculator Collection - HP Page
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HP-46 and HP-81 Service Manual - HP Calculator Literature
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Chris Varvares on Twitter: "My HP calculator (yes, with RPN) that I purchased when we opened MA's “off-campus” office in 1987 has finally died. I am considering that it is now time
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HP-55 - Wikipedia
HP-81
Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History