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公开(公告)号：US3406477A
公开(公告)日：1968-10-22
申请号：US61578667
申请日：1967-02-13
Applicant: IBM
Inventor： KOLLAR ERNEST P , JENSEN STANLEY M , TILEY DARWYN L
CPC classification number: G06K19/04 , G06K19/022 , Y10S493/944
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