More Replicas of Historical Calculating Machines Found | blog@CACM | Communications of the ACM
From the Pascaline to a 5-Digits Metallic and Planar Miniature Mechanical Calculator 1 cm in Lateral Size | SpringerLink
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LEIBNITZ CALCULATOR. /nCalculating machine invented by Gottfried Wilhelm von Leibnitz (1646-1716), capable of addition, subtraction, multiplication, division and the extraction of roots, 1673 Stock Photo - Alamy
History of Computers and Computing, Mechanical calculators, Pioneers, Gottfried Leibniz
Leibniz Invents the Stepped Drum Gear Calculator : History of Information
Calculator - Wikipedia
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Stepped reckoner - Wikipedia
Calculus And A Calculator | Hackaday
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Leibniz Invents the Stepped Drum Gear Calculator : History of Information
Step Reckoner, Leibniz Mechanical Calculator - Stock Image - C033/4347 - Science Photo Library
