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by nealabq
2962 days ago
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My father worked at HP in the 70s in Tool&Die, and made some of the molds for plastic pieces of the HP 35. He bought an HP 21 in '76. It's now my son's. It still works perfectly, except the battery is lost so we run a wire into the battery compartment. It's the most intuitive calculator I've ever used. |
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