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公开(公告)号：US3419884A
公开(公告)日：1968-12-31
申请号：US37888664
申请日：1964-06-29
Applicant: IBM
Inventor： PETER BETTS , REICHEL DONALD R , EISELEN EVERETT T
CPC classification number: G06K15/14 , G03G15/325
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