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METAL DETECTING DEVICE WITH INDUCTIVELY COUPLED COAXIAL TRANSMITTER AND RECEIVER COILS
US 3,471,773 A
Filed
: 12/20/1967
Issued
: 10/07/1969
Est. Priority Date
: 12/20/1967
Status: Expired due to Term
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Current Assignee
Robert S. Penland
Original Assignee
Robert S. Penland
Inventors
Penland, Robert S.
Application Number
US04/692,205
Time in Patent Office
657 Days
Field of Search
US Class Current
324/329
CPC Class Codes
G01V 3/15
specially adapted for use d...
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