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公开(公告)号：US2661494A
公开(公告)日：1953-12-08
申请号：US24689251
申请日：1951-09-17
Applicant: STANDARD OIL DEV CO
Inventor： CROOKSTON ROBERT R , BROWN STANLEY C
CPC classification number: E21B17/006 , F16L2101/12
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