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Four Function Mechanical Calculators
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PDF) Reinventing machines: The transmission history of the Leibniz calculator
Calculating Machines -- Stepped Drum Calculating Machines | National Museum of American History
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Stepped-Drum, Pinwheel & Direct Multiplication Calculators
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A Day at the Arithmeum – The Beary Adventures of Puffles and Honey
01) The first mechanical calculator for all four arithmetic operations by Gottfried Wilhelm Leibniz
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1.8 Leibniz and the Stepped Reckoner | Bit by Bit
Reinventing machines: the transmission history of the Leibniz calculator
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