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公开(公告)号：US2196077A
公开(公告)日：1940-04-02
申请号：US15026037
申请日：1937-06-25
Applicant: ALUMINUM CO OF AMERICA
Inventor： EMMETT MORROW JOHN , ROBERT WALL JAMES
IPC: C01F7/54
CPC classification number: C01F7/54
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