Parker 1954
Henry W. Parker, Flushing, N.Y. "Transducer" Filed: November 29, 1954 U.S. Patent 2,864,899 Granted: December 16, 1958

Parker 1954

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Filed: November 29, 1954
U.S. Patent 2,864,899
Granted: December 16, 1958

Henry W. Parker, Flushing, N.Y.
"Transducer"

Referenced by Walker and Williamson in U.S. Pat. 3,008,014.