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公开(公告)号：US2063942A
公开(公告)日：1936-12-15
申请号：US75001634
申请日：1934-10-25
Applicant: ALUMINUM CO OF AMERICA
Inventor： NOCK JR JOSEPH A , FRECHE HERTHA R
IPC: C22C21/12
CPC classification number: C22C21/12
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