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公开(公告)号：US1983717A
公开(公告)日：1934-12-11
申请号：US70528034
申请日：1934-01-04
Applicant: ALUMINUM CO OF AMERICA
Inventor： WAGNER GLENN H , MOWE WILBURN L
IPC: C01G28/02
CPC classification number: C01G28/023 , C01P2006/80
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