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公开(公告)号：US3149721A
公开(公告)日：1964-09-22
申请号：US7974960
申请日：1960-12-30
Applicant: IBM
Inventor： BISBEE GAIL A , SANBORN MALCOLM A
IPC: G01R33/12
CPC classification number: G01R33/1207
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