Willgodt T. Odhner patents the Odhner Arithmometer
29th October 1878 Willgodt T. Odhner (10 August 1845 - 15 September 1905) was granted a patent for the Odhner Arithmometer, a calculating machine that performed multiplications by repeated addition. In 1871, Odhner repaired a Thomas Arithmometer, and began to see how he could make improvements to the design. In particular, Odhner replaced a key component, the Leibniz cylinder, with a smaller, lighter pinwheel disc. Odhner was granted a patent for his design on 29th October 1878, patent number US209416. The patent was later acquired and incorporated into Brunsviga calculators that sold into the 1950s. Related information: Image:
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