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公开(公告)号：US3506870A
公开(公告)日：1970-04-14
申请号：US3506870D
申请日：1968-03-27
Applicant: MACHLETT LAB INC
Inventor： SINGER BARRY M , JOHNSON CARL T
CPC classification number: H01J21/18 , H01J19/34 , H01J2893/0003
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