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公开(公告)号：US2642034A
公开(公告)日：1953-06-16
申请号：US19669450
申请日：1950-11-20
Applicant: STANDARD OIL DEV CO
Inventor： GRIFFIN HAROLD F , WRIGHT MERRILL C
IPC: E21B17/00 , E21B17/042 , F16N7/32
CPC classification number: E21B17/006 , F16N7/32 , Y10T29/49885
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