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公开(公告)号：US1534032A
公开(公告)日：1925-04-21
申请号：US68920224
申请日：1924-01-29
Applicant: ALUMINUM CO OF AMERICA
Inventor： WILLIAM GABRIEL LEO
CPC classification number: G01N31/22 , C01F7/46 , C01P2006/60
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