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HEARING AID MECHANISMS THAT ARE LARGELY IMPERVIOUS TO THE LEAKAGE OF SOUND ENERGY AT AUDIO FREQUENCIES
US 3,457,375 A
Filed
: 10/01/1965
Issued
: 07/22/1969
Est. Priority Date
: 10/01/1965
Status: Expired due to Term
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Current Assignee
John W. Haggerty
Original Assignee
John W. Haggerty
Inventors
Haggerty, John W.
Application Number
US04/491,958
Time in Patent Office
1,390 Days
Field of Search
US Class Current
381/322
CPC Class Codes
H04R 25/456
mechanically
H04R 25/604
of acoustic or vibrational ...
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