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公开(公告)号：US2853377A
公开(公告)日：1958-09-23
申请号：US54922055
申请日：1955-11-18
Applicant: STORA KOPPARBERGS BERGSLAGS AB
Inventor： STURE KALLING BO MICHAEL , EVALD JOHANSSON FOLKE CARL
IPC: C21C5/32
CPC classification number: C21C5/32
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