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公开(公告)号：US2627391A
公开(公告)日：1953-02-03
申请号：US17160450
申请日：1950-07-01
Applicant: STANDARD OIL DEV CO
Inventor： CROOKSTON ROBERT R , CHAPPELL WALTER L
IPC: E21B19/00
CPC classification number: E21B19/008
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