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公开(公告)号：US3245306A
公开(公告)日：1966-04-12
申请号：US14316061
申请日：1961-10-05
Applicant: ALUMINUM CO OF AMERICA
Inventor： POTTER FRANKLIN R , TINGLE WILLIAM H
IPC: G01N21/57
CPC classification number: G01N21/57
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