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1.发明授权
公开(公告)号：US2381714A
公开(公告)日：1945-08-07
申请号：US43751042
申请日：1942-04-03
Applicant: ALUMINUM CO OF AMERICA
Inventor： BECK PAUL C
IPC: C22F1/04
CPC classification number: C22F1/04
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