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公开(公告)号：US2652117A
公开(公告)日：1953-09-15
申请号：US16849650
申请日：1950-06-16
Applicant: STANDARD OIL DEV CO
Inventor： ARENDT HARRY S , ABENDROTH GUSS F
IPC: E21B43/04
CPC classification number: E21B43/04
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