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公开(公告)号：US2744240A
公开(公告)日：1956-05-01
申请号：US20695651
申请日：1951-01-20
Applicant: ALUMINUM CO OF AMERICA
Inventor： HUGHES GUY N , HARDER RALPH N
IPC: G01R11/00
CPC classification number: G01R11/00
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