Innovative Calculating Machine Patent from 1878

Discover the fascinating history of the Odhner calculating machine and its impact on the world of mathematics. This patented device revolutionized multiplication through repeated additions. Learn how this modified version of Gottfried von Leibniz's stepped wheel paved the way for Brunsviga calculators that remained popular until the 1950s.

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Inventions of the 19th Century

National Museum of American History

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