The mechanical calculator (7 St. 50 Min, 18 Nov 2018 Jahr – 20 St. 53 Min, 30 Jul 2019 Jahr)
Beschreibung:
The mechanical calculator then invented by Thomas de Colmar in the mid-nineteenth century, and subsequent others. It was called the Arithmometer. The concept was improved with pinwheel calculators invented by Baldwin and Odhner.
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Counting/Caculating Inventions
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