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Electro-mechanical transducer
US 3,040,136 A
Filed
: 01/14/1959
Issued
: 06/19/1962
Est. Priority Date
: 01/14/1959
Status: Expired due to Term
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Current Assignee
Joseph F. Grado
Original Assignee
Joseph F. Grado
Inventors
Grado, Joseph F.
Application Number
US03/786,819
Time in Patent Office
1,252 Days
Field of Search
US Class Current
369/139
CPC Class Codes
H04R 9/16
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