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公开(公告)号：US3327768A
公开(公告)日：1967-06-27
申请号：US42771665
申请日：1965-01-25
Applicant: ALUMINUM CO OF AMERICA
Inventor： CRAIG RICHARD T , DIEFFENBACH ROBERT P
IPC: B22D11/047
CPC classification number: B22D11/047
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