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公开(公告)号：DE1533479A1
公开(公告)日：1970-04-09
申请号：DE1533479
申请日：1966-03-25
Applicant: IBM
Inventor： STUART FIELDS JUN DAVIS , LEE MEHL DANIEL , FREDERIC ADDIS BERNARD
IPC: B21D26/055 , C22F1/00
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