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公开(公告)号：US2864669A
公开(公告)日：1958-12-16
申请号：US46613254
申请日：1954-11-01
Applicant: STORA KOPPARBERGS BERGSLAGS AB
Inventor： KNUT AHLBORG , NICOLAUS CEDERQUIST KARL
IPC: C01B17/62
CPC classification number: C01B17/62 , Y10S423/03
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