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公开(公告)号：US2299458A
公开(公告)日：1942-10-20
申请号：US41894041
申请日：1941-11-13
Applicant: ALUMINUM CO OF AMERICA
Inventor： CHANDLER EDWARD M , CASTORA PETER J
IPC: B21C47/24
CPC classification number: B21C47/24
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