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公开(公告)号：US2943036A
公开(公告)日：1960-06-28
申请号：US65854757
申请日：1957-05-13
Applicant: BECKMAN INSTRUMENTS INC
Inventor： THAYER LOUIS C , JAN HAAGEN-SMIT
IPC: G01N27/49
CPC classification number: G01N27/404
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