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My “HP” WP 34S calculator. A custom-built calculator made by Walter Bonin, Paul Dale and Marcus von Cube in the body of an HP 30b. : r/calculators
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DATAMATH
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File:Macro photo of HP logo inside back of HP-30B calculator (26933017923).jpg - Wikimedia Commons
WP 31S RPN scientific calculator - A former HP 30b financial converted with new firmware and a vinyl overla… | Calculator, Scientific calculator, Pocket calculators