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公开(公告)号：US2923040A
公开(公告)日：1960-02-02
申请号：US59802556
申请日：1956-07-16
Applicant: ALUMINUM CO OF AMERICA
Inventor： GOODWIN CARL L , ENNOR WILLIAM T
IPC: B22D18/06
CPC classification number: B22D18/06
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