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Ear mounted hearing aid device
US 2,874,231 A
Filed
: 12/02/1955
Issued
: 02/17/1959
Est. Priority Date
: 12/02/1955
Status: Expired due to Term
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Current Assignee
Frank B. Wallace
Original Assignee
Frank B. Wallace
Inventors
Wallace, Frank B.
Application Number
US03/550,642
Time in Patent Office
1,173 Days
Field of Search
US Class Current
381/380
CPC Class Codes
H04R 25/652
Ear tips; Ear moulds hybrid...
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