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Amazon.com: Posterazzi Step Reckoner Leibniz Mechanical Calculator Poster Print by Science Source, (36 x 24), Varies: Posters & Prints
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A Leibniz Stepped Reckoner calculator - CHM Revolution | Computer history museum, Mechanical calculator, Mechanical design
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Amazon.com: Step Reckoner Leibniz Mechanical Calculator Poster Print by Science Source (24 x 36): Posters & Prints
CASIO Calculators Global - Gottfried Wilhelm Leibniz – mathematician, philosopher, and a talented technician from Germany. In 1673 he built the Step Reckoner, first calculating machine that could perform all four arithmetic
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