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公开(公告)号：US3498783A
公开(公告)日：1970-03-03
申请号：US3498783D
申请日：1967-05-04
Applicant: STORA KOPPARBERGS BERGSLAGS AB
Inventor： JOHANSSON FOLKE KARL EVALD , CEDERVALL GOSTA HUGO
CPC classification number: C21C5/32 , C21C5/56 , F27B7/2083
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