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公开(公告)号：US1911081A
公开(公告)日：1933-05-23
申请号：US65695533
申请日：1933-02-15
Applicant: ALUMINUM CO OF AMERICA
Inventor： FRED KELLER , CRAIGHEAD CHARLES M
IPC: C22C21/08
CPC classification number: C22C21/08
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