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US 2,946,860 A
Filed
: 01/03/1957
Issued
: 07/26/1960
Est. Priority Date
: 01/03/1957
Status: Expired due to Term
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Current Assignee
Richard E. Jansen
,
Ulrich, Robert E.
Original Assignee
Richard E. Jansen
,
Ulrich, Robert E.
Inventors
Jansen, Richard E.
,
Ulrich, Robert E.
Application Number
US03/632,363
Time in Patent Office
1,300 Days
Field of Search
US Class Current
181/129
CPC Class Codes
H04R 1/1008
Earpieces of the supra-aura...
H04R 1/1066
Constructional aspects of t...
H04R 5/0335
Earpiece support, e.g. head...
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