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公开(公告)号：US2937455A
公开(公告)日：1960-05-24
申请号：US78220158
申请日：1958-12-22
Applicant: IBM
Inventor： KENNETH PERKINS NORWOOD , TOBEN BERNARD E , BEATTIE HORACE S
CPC classification number: G09B19/02 , G09B17/003
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