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公开(公告)号：US3055794A
公开(公告)日：1962-09-25
申请号：US62523356
申请日：1956-11-30
Applicant: STORA KOPPARBERGS BERGSLAGS AB
Inventor： BERTIL LUNDEN OLOF , ESBJORN EFTRING KARL , FREDRIK BJELKE BERTIL
IPC: D21C9/08
CPC classification number: D21C9/08
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