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PIPELINE INSPECTION APPARATUS WITH MEANS FOR CORRELATING THE RECORDED DEFECT SIGNALS WITH THE ANGULAR POSITION WITHIN THE PIPELINE AT WHICH THEY WERE GENERATED

  • US 3,460,028 A
  • Filed: 11/03/1967
  • Issued: 08/05/1969
  • Est. Priority Date: 11/03/1967
  • Status: Expired due to Term
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