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公开(公告)号：US2854077A
公开(公告)日：1958-09-30
申请号：US47846254
申请日：1954-12-29
Applicant: IBM
Inventor： NOVAK DONALD A , CARROLL FRED M
CPC classification number: B26D1/25 , Y10T83/4749 , Y10T83/4757
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