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公开(公告)号：US2980885A
公开(公告)日：1961-04-18
申请号：US69876657
申请日：1957-11-25
Applicant: MANDREL INDUSTRIES
Inventor： MIZE DOYLE D , SUNDT PETER C , DREWS MARVIN A
IPC: G01V1/36
CPC classification number: G01V1/362 , G01V2210/52 , G01V2210/53
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