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公开(公告)号：US2843732A
公开(公告)日：1958-07-15
申请号：US54194655
申请日：1955-10-21
Applicant: RCA CORP
Inventor： JOHNSON EDWARD O , HERNQVIST KARL J
CPC classification number: H01J25/00 , H01J25/005 , H03B9/00
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