Mechanical Calculators - History-Computer
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Mechanical calculator - Wikipedia
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Pascal's calculator (also known as the arithmetic machine or Pascaline), a mechanical calculator invented by Blaise Pascal in the early 17th century. Pascal was led to develop a calculator by the laborious
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1950's Germany Triumphator Brand CN1 model Mechanical Calculator – Vintage Type Shop
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File:Mechanical calculator (ten places), Blaise Pascal, France, c. 1650 - Mathematisch-Physikalischer Salon, Dresden - DSC07976.JPG - Wikimedia Commons
Motor Driven Mechanical Calculators
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