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公开(公告)号：US3089593A
公开(公告)日：1963-05-14
申请号：US4404560
申请日：1960-07-20
Applicant: ALUMINUM CO OF AMERICA
Inventor： HONNERT QUENTIN E
IPC: G01M3/36
CPC classification number: G01M3/36 , Y10S209/913
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