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公开(公告)号：US2979692A
公开(公告)日：1961-04-11
申请号：US55362555
申请日：1955-12-16
Applicant: CALIFORNIA RESEARCH CORP
Inventor： GRANNEMANN WAYNE W , TROREY GEORGE A W
IPC: G01V1/28
CPC classification number: G01V1/28 , G01V2210/20
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