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Piezoelectric transducers
US 2,786,899 A
Filed
: 08/02/1951
Issued
: 03/26/1957
Est. Priority Date
: 08/02/1951
Status: Expired due to Term
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Current Assignee
Richard W. Carlisle
Original Assignee
Richard W. Carlisle
Inventors
Carlisle, Richard W.
Application Number
US03/239,905
Time in Patent Office
2,063 Days
Field of Search
US Class Current
381/173
CPC Class Codes
H04R 17/02
Microphones
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