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公开(公告)号：US2533563A
公开(公告)日：1950-12-12
申请号：US79110047
申请日：1947-12-11
Applicant: TIDE WATER ASSOCIATED OIL COMP
Inventor： DOBBS WILLIAM D
IPC: E21B37/00
CPC classification number: E21B37/00
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