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公开(公告)号：US2635738A
公开(公告)日：1953-04-21
申请号：US8839249
申请日：1949-04-19
Applicant: ALUMINUM CO OF AMERICA
Inventor： AVEY WILLIAM P , HERRINGTON HOWARD H , MEYER LAWRENCE W , MCLAUGHLIN JOSEPH E
IPC: B21C19/00
CPC classification number: B21C19/00
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