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HEADPHONE APPARATUS HAVING SELECTABLE LOUDSPEAKER OR EARPIECE SOUND REPRODUCER
US 3,512,088 A
Filed
: 03/14/1967
Issued
: 05/12/1970
Est. Priority Date
: 03/14/1967
Status: Expired due to Term
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Current Assignee
Ross Samuel
Original Assignee
Ross Samuel
Inventors
ROSS SAMUEL
Application Number
US04/623,030
Time in Patent Office
1,155 Days
Field of Search
US Class Current
455/149
CPC Class Codes
H04R 1/1008
Earpieces of the supra-aura...
H04R 1/1041
Mechanical or electronic sw...
H04R 2420/03
Connection circuits to sele...
H04R 5/04
Circuit arrangements, e.g. ...
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