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公开(公告)号：US2196854A
公开(公告)日：1940-04-09
申请号：US11744036
申请日：1936-12-24
Applicant: RCA CORP
Inventor： FREDERIK COETERIER , CORNELIS TEVES MARTEN
CPC classification number: H01J29/023 , H01J31/503
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