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公开(公告)号：US2207334A
公开(公告)日：1940-07-09
申请号：US26293639
申请日：1939-03-20
Applicant: UNION OIL CO
Inventor： REYNOLDS JOHN M , NEWTON WILLIAM M , LEDBETTER JERRY T
IPC: E21B43/04
CPC classification number: E21B43/04
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