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Telephone patching circuit
US 3,397,288 A
Filed
: 10/04/1965
Issued
: 08/13/1968
Est. Priority Date
: 10/04/1965
Status: Expired due to Term
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Current Assignee
Lawrence J. Semon
Original Assignee
Lawrence J. Semon
Inventors
Semon, Lawrence J.
Application Number
US04/492,374
Time in Patent Office
1,044 Days
Field of Search
US Class Current
379/267
CPC Class Codes
H04M 19/04
the ringing-current being g...
H04M 3/64
Arrangements for signalling...
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