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10key
10keypad
1914
1198487
18801930
1950s
adding
american calculator calculators cofounder common computer continued corporationnnsundstrands david decades development extensive filed first had illustration invention inventor keyboard keyboards keypads machine machines now numeric patent place range seminal showing sundstrand swedishborn used vintage wasVintage Illustration Of A Sundstrand Adding Machine
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Vintage illustration of a Sundstrand Adding Machine #252682798
Description
Vintage illustration showing a Sundstrand Adding Machine. David Sundstrand 1880-1930 was a Swedish-born American inventor of the 10-key adding machine, 10-key calculator keyboard, a 10-keypad now used on computer keyboards, and a co-founder of Sundstrand Corporation.Sundstrand`s 1914 adding machine had the first now common place keyboard for 10-key calculators and numeric keypads. This 1914 invention was filed as patent No. 1198487. This invention was seminal to the development of an extensive range of machines that continued for decades into the 1950s
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