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公开(公告)号：US3358937A
公开(公告)日：1967-12-19
申请号：US50721865
申请日：1965-11-10
Applicant: ALUMINUM CO OF AMERICA
Inventor： ALAN PEARSON , GEORGE MACZURA
IPC: C01F7/02
CPC classification number: C01F7/023
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