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公开(公告)号：US1572490A
公开(公告)日：1926-02-09
申请号：US851725
申请日：1925-02-11
Applicant: ALUMINUM CO OF AMERICA
Inventor： JOHNSTON RODERICK L , ARCHER ROBERT S , ZAY JEFFRIES
IPC: C22C21/02
CPC classification number: C22C21/02
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