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Hearing aid
US 2,977,425 A
Filed
: 09/14/1959
Issued
: 03/28/1961
Est. Priority Date
: 09/14/1959
Status: Expired due to Term
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Current Assignee
Irwin H. Cole
Original Assignee
Irwin H. Cole
Inventors
Cole, Irwin H.
Application Number
US03/839,629
Time in Patent Office
561 Days
Field of Search
US Class Current
381/326
CPC Class Codes
H04R 25/606
acting directly on the eard...
H04R 25/65
Housing parts, e.g. shells,...
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