Kellogg 1929 G.B.
Edward W. Kellogg "Production of Sound" Filed: September 27, 1929 G.B. Patent 346,646 Granted: December 4, 1934

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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.