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Noise controlled sound reproducing system
US 3,410,958 A
Filed
: 03/25/1965
Issued
: 11/12/1968
Est. Priority Date
: 03/25/1965
Status: Expired due to Term
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Current Assignee
Abraham B. Cohen
Original Assignee
Abraham B. Cohen
Inventors
Cohen, Abraham B.
Application Number
US04/442,688
Time in Patent Office
1,328 Days
Field of Search
US Class Current
381/57
CPC Class Codes
H03G 3/32
the control being dependent...
H04R 27/00
Public address systems circ...
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