Friden, Inc. (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Friden, Inc." in English language version.

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legacy.com

  • "1928–2012 Obituary Condolences Robert (Bob) Ragen". Legacy.com. Archived from the original on 2017-12-18. Retrieved 2016-01-01. Bob holds over 80 patents awarded during his work as Director of RD for Friden, and Singer and as Senior Project Engineer at Xerox. He retired from Xerox RD in 1990. He is responsible for the development of the first commercial electronic calculator, the Friden 130, which has been displayed at the Smithsonian.

oldcalculatormuseum.com

web.archive.org

  • "1928–2012 Obituary Condolences Robert (Bob) Ragen". Legacy.com. Archived from the original on 2017-12-18. Retrieved 2016-01-01. Bob holds over 80 patents awarded during his work as Director of RD for Friden, and Singer and as Senior Project Engineer at Xerox. He retired from Xerox RD in 1990. He is responsible for the development of the first commercial electronic calculator, the Friden 130, which has been displayed at the Smithsonian.
  • "Friden EC-130 Electronic Calculator". www.oldcalculatormuseum.com. Archived from the original on 2024-06-25. Retrieved 2006-06-06.
  • "Friden EC-132 Electronic Calculator". www.oldcalculatormuseum.com. Archived from the original on 2007-10-16. Retrieved 2007-10-05.