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公开(公告)号：US2689144A
公开(公告)日：1954-09-14
申请号：US19120450
申请日：1950-10-20
Applicant: STANDARD OIL DEV CO
Inventor： UHRIG LEO V , ATKINS JR JOHN N
IPC: E21B47/06
CPC classification number: E21B47/065 , Y10S277/91
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