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公开(公告)号：US3495911A
公开(公告)日：1970-02-17
申请号：US3495911D
申请日：1969-04-18
Applicant: IBM
Inventor： DURAND ROBERT D , HAHS THOMAS S
IPC: G01B9/02
CPC classification number: G01B9/02028 , G01B2290/70
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