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公开(公告)号：US2236668A
公开(公告)日：1941-04-01
申请号：US20726638
申请日：1938-05-11
Applicant: STANDARD OIL DEV CO
Inventor： BLAU LUDWIG W , RUSSELL THOMPSON ROBERT
IPC: G01V3/22
CPC classification number: G01V3/22
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