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公开(公告)号：US2690517A
公开(公告)日：1954-09-28
申请号：US31229852
申请日：1952-09-30
Applicant: RCA CORP
Inventor： HERMES NICOLL FREDERICK , BENJAMIN KAZAN
IPC: H01J31/20
CPC classification number: H01J31/205
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