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.
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