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1.发明授权
公开(公告)号：US3274874A
公开(公告)日：1966-09-27
申请号：US39548964
申请日：1964-09-10
Applicant: IBM
Inventor： TREIBER WALTER C , MCGILL RICHARD A
CPC classification number: G06K19/022 , B26D1/245 , B26D7/20 , B26D2007/202 , B26F1/10 , Y10T83/4844 , Y10T83/9312
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