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公开(公告)号：US1976991A
公开(公告)日：1934-10-16
申请号：US60634932
申请日：1932-04-20
Applicant: ALUMINUM CO OF AMERICA
Inventor： HERSAM ANDREW J
IPC: B21D51/36
CPC classification number: B21D51/36 , Y10T29/5134
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