Filed: September 27, 1929
G.B. Patent 346,646
Granted: December 4, 1934
Edward W. Kellogg "Production of Sound"
Referenced by Walker in U.S. Pat. 3,773,984.
Filed: September 27, 1929
G.B. Patent 346,646
Granted: December 4, 1934
Edward W. Kellogg "Production of Sound"
Referenced by Walker in U.S. Pat. 3,773,984.
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