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公开(公告)号：US2666620A
公开(公告)日：1954-01-19
申请号：US3010248
申请日：1948-05-29
Applicant: STANDARD OIL DEV CO
Inventor： WELGE HENRY J , WEST ROBERT C
IPC: E21B25/08
CPC classification number: E21B25/08
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