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公开(公告)号：US3163696A
公开(公告)日：1964-12-29
申请号：US19305962
申请日：1962-05-02
Applicant: STORA KOPPARBERGS BERGSLAGS AB
Inventor： EVALD JOHANSSON FOLKE KARL , ERIK BERGSTROM SVEN
CPC classification number: C21C5/42 , C21C5/4633 , C21C5/50
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