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公开(公告)号：US2308160A
公开(公告)日：1943-01-12
申请号：US32430840
申请日：1940-03-16
Applicant: STANDARD OIL DEV CO
Inventor： ECKEL JOHN E , MCCARTY GEORGE M
IPC: E21B43/38
CPC classification number: E21B43/38
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