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公开(公告)号：US1932836A
公开(公告)日：1933-10-31
申请号：US63415332
申请日：1932-09-21
Applicant: ALUMINUM CO OF AMERICA
Inventor： WOOD ROBERT T , HEIL OTTO H
IPC: C22C21/10
CPC classification number: C22C21/10
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