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  • cables including means for applying a composite signal having fundamental and even harmonic frequency componentsUS3526831 *Nov 21, 1968Sep 1, 1970North American RockwellMethod for tracking underwater pipelines and detecting flaws in the coating thereofUS3792350 *Mar 15, 1972Feb 12, 1974Bell Telephone Labor IncDetection of metalshield faults in buried cable* Cited by examinerReferenced byCiting Pat
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