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David Sundstrand
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. His 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.〔(Patent number: 1198487;Filing date: Mar 14, 1914;Issue date: Sep 19, 1916 )〕
This invention was seminal to the development of an extensive range of machines that continued for decades into the 1950s.
〔(New York Times:OSCAR SUNDSTRAND, INVENTOR, DIES AT 82;January 6, 1972 )〕
〔(The Golden Age of Mechanical Calculators;The Evolution of the Modern Calculator Keypad )〕
〔(History of Sundstrand machine tool corporation )〕
〔(Rockford Tool Company 1905 )〕
〔(Patent number: 1329028;Filing date: Mar 11, 1912;Issue date: Jan 27, 1920 )〕
〔(Retrocalculators;Sundstran adding machine )〕
〔(Sundstrand Corporation Company History;In 1914 David Sundstrand, Oscar's brother and an employee at the Rockford Milling Machine Company, developed a ten-key adding machine. )〕
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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