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公开(公告)号：US3540033A
公开(公告)日：1970-11-10
申请号：US3540033D
申请日：1967-12-28
Applicant: IBM
Inventor： CRAWFORD JOHN K , CROLL DONALD C , HULSIZER JOHN C , KENDALL FRANK T , SCHAEFFER GEORGE B JR
CPC classification number: G09G3/045
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