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公开(公告)号：US3153839A
公开(公告)日：1964-10-27
申请号：US16569962
申请日：1962-01-11
Applicant: RAULAND CORP
Inventor： SERGE PAKSWER , DOWD JAMES J
CPC classification number: H01J5/20 , H01J5/22 , H01J5/24 , H01J2893/0037 , H01J2893/0039
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