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公开(公告)号：US2989638A
公开(公告)日：1961-06-20
申请号：US71142158
申请日：1958-01-27
Applicant: LEESONA CORP
Inventor： HERBERT LAUDON , TUERCK JR WILLIAM
IPC: G01N21/37
CPC classification number: G01N21/37
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