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公开(公告)号：US2364975A
公开(公告)日：1944-12-12
申请号：US31137039
申请日：1939-12-28
Applicant: STANDARD OIL DEV CO
Inventor： HEIGL JOHN J , HODELL LOUIS R
IPC: E21B49/00
CPC classification number: E21B49/005
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