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公开(公告)号：US2575166A
公开(公告)日：1951-11-13
申请号：US79298847
申请日：1947-12-20
Applicant: STANDARD OIL DEV CO
Inventor： DUNAWAY JAMES H , POWELL PAUL B
IPC: G01C21/20
CPC classification number: G01C21/20
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