Etablissements S.M. 1946
Etablissements S.M. Body Corporate of 26 Rue de Lagny, Paris. "Improvements in Electrostatic Microphones and Loud-speakers"

Etablissements S.M. 1946

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Filed: April 9, 1946
G.B. Patent 610,297
Granted: Oct. 13, 1948

Etablissements S.M. Body Corporate of 26 Rue de Lagny, Paris.
"Improvements in Electrostatic Microphones and Loud-speakers"

Referenced by Walker and Williamson in U.S. Pat. 3,008,013.