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公开(公告)号：US2888568A
公开(公告)日：1959-05-26
申请号：US39574453
申请日：1953-12-02
Applicant: CALIFORNIA RESEARCH CORP
Inventor： JONES STANLEY B , MEYERHOFF WALTER E
IPC: G01V5/10
CPC classification number: G01V5/101
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