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1.发明授权
公开(公告)号：US3267431A
公开(公告)日：1966-08-16
申请号：US27661263
申请日：1963-04-29
Applicant: IBM
Inventor： GREENBERG HERBERT J , KONHEIM ALAN G
IPC: G06K9/66
CPC classification number: G06K9/66
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