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公开(公告)号：US2614053A
公开(公告)日：1952-10-14
申请号：US16484850
申请日：1950-05-27
Applicant: ALUMINUM CO OF AMERICA
Inventor： BOBB RUSSELL V , BRUNGER ROBERT G
CPC classification number: C22C21/08 , B21C23/002
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