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Danie van der Merwe on Twitter: "This Open Source WP 34S calculator is based on a HP-42S RPN Scientific Calculator #WP34S https://t.co/ET8Ahjm4b3" / Twitter
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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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