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1.发明授权Electrical conductivity probe having a conductive, spongy fluid filled wiper member for checking interior coatings of pipe 失效导电探针具有用于检查管道内部涂层的导电的海绵状流体填充的擦拭器部件
公开(公告)号：US3359487A
公开(公告)日：1967-12-19
申请号：US35919264
申请日：1964-04-13
Applicant: TEXACO INC
Inventor： NATHAN CHARLES C , KILNAR JULIUS J , PITTMAN ROBERT W
CPC classification number: E21B47/00 , G01N27/205
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