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公开(公告)号：US2029499A
公开(公告)日：1936-02-04
申请号：US41836230
申请日：1930-01-03
Applicant: ALUMINUM CO OF AMERICA
Inventor： NORTON AILEN B , MARIUS GUYOT
IPC: B22C9/06
CPC classification number: B22C9/06
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