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公开(公告)号：US2807913A
公开(公告)日：1957-10-01
申请号：US47456354
申请日：1954-12-10
Applicant: RCA CORP
Inventor： FRANCIS NICKL EDWIN
IPC: H01J5/24
CPC classification number: H01J5/24 , H01J2893/0039
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