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公开(公告)号：US3279231A
公开(公告)日：1966-10-18
申请号：US33175963
申请日：1963-12-19
Applicant: ALUMINUM CO OF AMERICA
Inventor： HASS FOSTER W , ANDERSON CARL R
IPC: B21C23/08
CPC classification number: B21C23/085 , B21C23/08
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