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Insert earphone and operative subassembly therefor
US 2,595,489 A
Filed
: 10/03/1945
Issued
: 05/06/1952
Est. Priority Date
: 07/16/1941
Status: Expired due to Term
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Current Assignee
Donald E. Rutter
,
Harry B. Shaper
,
Walter J. Brown
Original Assignee
Donald E. Rutter
,
Harry B. Shaper
,
Walter J. Brown
Inventors
Rutter, Donald E.
,
Shaper, Harry B.
,
Brown, Walter J.
Application Number
US02/620,118
Time in Patent Office
2,407 Days
Field of Search
US Class Current
381/190
CPC Class Codes
H04R 17/00
Piezoelectric transducers; ...
H04R 2460/15
Determination of the acoust...
H04R 25/55
using an external connectio...
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