Today in 1850, the first US patent for a push-key operated adding machine is issued to Dubois D. Parmelee of New Paltz, New York (US No. 7,074). The first commercially successful calculator will be invented forty years later by William Burroughs.
Today in 1850, the first US patent for a push-key operated adding machine is issued to Dubois D. Parmelee of New Paltz, New York (US No. 7,074). The first commercially successful calculator will be invented forty years later by William Burroughs.
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