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.[1] This invention was seminal to the development of an extensive range of machines that continued for decades into the 1950s. [2] [3] [4] [5] [6] [7] [8]

References

  1. ↑ Patent number: 1198487;Filing date: Mar 14, 1914;Issue date: Sep 19, 1916
  2. ↑ New York Times:OSCAR SUNDSTRAND, INVENTOR, DIES AT 82;January 6, 1972
  3. ↑ The Golden Age of Mechanical Calculators;The Evolution of the Modern Calculator Keypad
  4. ↑ History of Sundstrand machine tool corporation
  5. ↑ Rockford Tool Company 1905
  6. ↑ Patent number: 1329028;Filing date: Mar 11, 1912;Issue date: Jan 27, 1920
  7. ↑ Retrocalculators;Sundstran adding machine
  8. ↑ 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.