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公开(公告)号：US2618032A
公开(公告)日：1952-11-18
申请号：US11088349
申请日：1949-08-17
Applicant: ALUMINUM CO OF AMERICA
Inventor： TRAENKNER FREDERICK O
IPC: B22C3/00 , B22D11/041
CPC classification number: B22D11/041 , B22C3/00
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