Williamson 1955
David Theodore Nelson Williamson, Edinburgh, Scotland assigned rights to Ferranti Ltd., London. Peter James Walker of Huntingdon, England. "Electrostatic Loudspeakers"

Williamson & Walker 1955

 

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Filed: July 15, 1955

U.S. Patent 3,008,013
Granted: November 7, 1961

David Theodore Nelson Williamson, Edinburgh, Scotland assigned rights to Ferranti Ltd., London. Peter James Walker of Huntingdon, England.
"Electrostatic Loudspeakers"