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公开(公告)号：US3145586A
公开(公告)日：1964-08-25
申请号：US16134161
申请日：1961-12-19
Applicant: IBM
Inventor： BREARLEY DONALD W , REX DONALD K
IPC: B21D37/20
CPC classification number: B21D37/205 , B21D37/20 , Y10S76/11 , Y10T83/9437
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