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Hearing aid
US 3,055,990 A
Filed
: 06/05/1961
Issued
: 09/25/1962
Est. Priority Date
: 06/05/1961
Status: Expired due to Term
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Current Assignee
Joseph J. Sidlo
Original Assignee
Joseph J. Sidlo
Inventors
Sidlo, Joseph J.
Application Number
US04/114,906
Time in Patent Office
477 Days
Field of Search
US Class Current
381/321
CPC Class Codes
H04R 25/60
Mounting or interconnection...
H04R 25/603
of mechanical or electronic...
H04R 25/609
of circuitry of electronic ...
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