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公开(公告)号：US2496333A
公开(公告)日：1950-02-07
申请号：US72204047
申请日：1947-01-14
Applicant: NAT TECHNICAL LAB
Inventor： CARY HENRY H , GEORGE KENYON P
IPC: G01N21/25
CPC classification number: G01N21/251
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