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公开(公告)号：US2984891A
公开(公告)日：1961-05-23
申请号：US70262857
申请日：1957-12-13
Applicant: RCA CORP
Inventor： GRESWOLD FORREST E
IPC: H01J19/46
CPC classification number: H01J19/46 , H01J2893/0007 , Y10T29/53265 , Y10T29/53974
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