Parker 1954
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.
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.
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