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公开(公告)号：US2324855A
公开(公告)日：1943-07-20
申请号：US37717641
申请日：1941-02-03
Applicant: ALUMINUM CO OF AMERICA
Inventor： LANE NORMAN B , MINGLE WILLIAM S , COLSON HERMAN H
IPC: B21C47/24
CPC classification number: B21C47/24
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