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Wed Otto Shweiger Envented Millioner

Wed Otto Shweiger Envented Millioner

Other stepped drum calculating devices included Otto Shweigers Millionaire calculator 1893 and Curt Herstarks Curta early 1940s. Pinwheel Calculators. Another class of calculators independently invented by Frank S. Baldwin and W. T. Odhner in the 1870s is known as pinwheel calculators they used a pinwheel for specifying a number

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