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1.发明授权
公开(公告)号：US3249754A
公开(公告)日：1966-05-03
申请号：US18241762
申请日：1962-03-26
Applicant: BECKMAN INSTRUMENTS INC
Inventor： MILTON LAIKIN , ROHRER DAVID A
CPC classification number: G01N21/255 , G01J3/10 , G01N21/645 , H01J61/10 , H01J61/92
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