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公开(公告)号：US2623593A
公开(公告)日：1952-12-30
申请号：US9845849
申请日：1949-06-11
Applicant: STANDARD OIL DEV CO
Inventor： THOMAS PENNINGTON , JONES MARVIN R
IPC: E21B43/10
CPC classification number: E21B43/101 , Y10T403/1666
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