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Improvements to the Carbon Microphone
(1932)
  • Edmund Ramsay Wigan, Siemens
Abstract
Patent Application GB383348A, in the Name of Siemens
Publication Date
Winter November 17, 1932
Citation Information
Edmund Ramsay Wigan. "Improvements to the Carbon Microphone" (1932)
Available at: http://works.bepress.com/edmund-wigan/31/