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公开(公告)号：US3192035A
公开(公告)日：1965-06-29
申请号：US27478063
申请日：1963-04-22
Applicant: STORA KOPPARBERGS BERGSLAGS AB
Inventor： HARALD JONSSON NILS
CPC classification number: C21C7/0087 , C21C5/4653
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