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公开(公告)号：US2968835A
公开(公告)日：1961-01-24
申请号：US72305958
申请日：1958-03-21
Applicant: ALUMINUM CO OF AMERICA
Inventor： WESTON JR SAMUEL C , OSWALD JOHN W
CPC classification number: B21C25/02 , B29C47/0019 , B29C47/003 , B29C47/12
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