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APPARATUS AND METHODS FOR SILENTLY SURVEYING AUTOMOBILE RADIOS
US 3,434,150 A
Filed
: 04/10/1967
Issued
: 03/18/1969
Est. Priority Date
: 04/10/1967
Status: Expired due to Term
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Current Assignee
PCP, Inc.
Original Assignee
Roger F. Wernlund
Inventors
Wernlund, Roger F.
Application Number
US04/629,632
Time in Patent Office
708 Days
Field of Search
US Class Current
346/37
CPC Class Codes
H04H 20/57
for mobile receivers
H04H 60/31
Arrangements for monitoring...
H04H 60/43
for identifying broadcast c...
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