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SINTERED TRANSDUCER HOUSING PROVIDING ACOUSTICAL RESISTANCE AND WATERPROOFING
US 3,539,735 A
Filed
: 04/28/1967
Issued
: 11/10/1970
Est. Priority Date
: 04/28/1967
Status: Expired due to Term
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Current Assignee
Gaston A. Marchand
Original Assignee
Gaston A. Marchand
Inventors
Marchand, Gaston A.
Application Number
US04/634,573
Time in Patent Office
1,292 Days
Field of Search
US Class Current
381/150
CPC Class Codes
H04R 1/22
for obtaining desired frequ...
H04R 1/44
Special adaptations for sub...
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