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公开(公告)号：US2957092A
公开(公告)日：1960-10-18
申请号：US77813258
申请日：1958-12-04
Applicant: ALUMINUM CO OF AMERICA
Inventor： CLINE CHARLES W , VON STOCKER SELMER G
IPC: G01N29/28
CPC classification number: G01N29/28
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