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公开(公告)号：US1944733A
公开(公告)日：1934-01-23
申请号：US63910632
申请日：1932-10-22
Applicant: ALUMINUM CO OF AMERICA
Inventor： DOERSCHUK VICTOR C , SCHOEFFEL ERWIN G
CPC classification number: B22D37/00 , B22D45/00 , Y10T137/2877
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