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In 1895, Otto Steiger, a Swiss citizen residing in Munich, obtained a U.S. patent for a calculating machine that would multiply a number by a single digit directly, with only a single turn of a crank. Earlier calculating machines required considerably more effort.
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the Millionaire Calculating Machine, 1918
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the Millionaire Calculating Machine, 1918
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Sold at Auction: The Millionaire Calculating Machine, c. 1900