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公开(公告)号：US3087213A
公开(公告)日：1963-04-30
申请号：US69856757
申请日：1957-11-25
Applicant: ALUMINUM CO OF AMERICA
Inventor： MILLIKEN SPENCER R , SCHAFER EARL J
IPC: B22D11/07
CPC classification number: B22D11/07
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