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1.发明授权
公开(公告)号：US3376424A
公开(公告)日：1968-04-02
申请号：US41900464
申请日：1964-12-17
Applicant: IBM
Inventor： NORMAN BRASLAU , HARDY WILTON A
CPC classification number: G09G3/045 , B41B21/28 , G02B17/004
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