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公开(公告)号：US2257170A
公开(公告)日：1941-09-30
申请号：US18606138
申请日：1938-01-21
Applicant: STANDARD OIL DEV CO
Inventor： HOWELL LYNN G
IPC: G01V9/00
CPC classification number: G01V9/007 , Y10T436/255
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