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公开(公告)号：US2961500A
公开(公告)日：1960-11-22
申请号：US74007758
申请日：1958-06-05
Applicant: IBM
Inventor： CLARKE HENRY R , DAYKIN DONALD R , JUDSON GEORGE T
IPC: G04C23/22
CPC classification number: G04C23/22
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