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.
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.
References
- ↑ Patent number: 1198487;Filing date: Mar 14, 1914;Issue date: Sep 19, 1916
- ↑ 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" (PDF). Archived from the original (PDF) on 2013-10-08. Retrieved 2012-02-25.
- ↑ Patent number: 1329028;Filing date: Mar 11, 1912;Issue date: Jan 27, 1920
- ↑ "Retrocalculators;Sundstran adding machine". Archived from the original on 2012-02-22. Retrieved 2012-02-25.
- ↑ 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.
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