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公开(公告)号：US3378765A
公开(公告)日：1968-04-16
申请号：US33593564
申请日：1964-01-06
Applicant: IBM
Inventor： MANFRED HILSENRATH , MCGURN TERENCE J
IPC: G01R27/26
CPC classification number: G01R27/2605
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