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Filed: Sept. 27, 1929
U.S. Patent 1,983,377
Granted: December 4, 1934
Edward Washburn Kellogg, Schenectady, N.Y. assigned rights to General Electric Co., N.Y.
"Production of Sound"
Referenced by Walker and Williamson in U.S. Pat. 3,008,013. Also ref: GB Patent 346,646 which pre-dates this grant of patent on the same device.
See prior citation of E.W. Kellogg.