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公开(公告)号：US2934696A
公开(公告)日：1960-04-26
申请号：US70637357
申请日：1957-12-31
Applicant: IBM
Inventor： WILLIAMS CLIFFORD W , SEELBACH WALTER C , DUMAS ALLAN M
IPC: G01R33/14
CPC classification number: G01R33/14
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