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MICROPHONE DEVICE
US 3,515,240 A
Filed
: 09/23/1968
Issued
: 06/02/1970
Est. Priority Date
: 09/28/1967
Status: Expired due to Term
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Current Assignee
Matsumoto Rimpey
,
Sugiyama Akira
,
Tanaka Tadami
,
Yasuhiro Riko
Original Assignee
Matsumoto Rimpey
,
Sugiyama Akira
,
Tanaka Tadami
,
Yasuhiro Riko
Inventors
SUGIYAMA AKIRA
,
TANAKA TADAMI
,
MATSUMOTO RIMPEY
,
RIKO YASUHIRO
Application Number
US04/761,766
Time in Patent Office
617 Days
Field of Search
US Class Current
181/158
CPC Class Codes
H04R 1/086
Protective screens, e.g. al...
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