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公开(公告)号：US2242944A
公开(公告)日：1941-05-20
申请号：US27193239
申请日：1939-05-05
Applicant: ALUMINUM CO OF AMERICA
Inventor： DIX JR EDGAR H , NOEK JR JOSEPH A
IPC: C22C21/12
CPC classification number: C22C21/12
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