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公开(公告)号：US2078304A
公开(公告)日：1937-04-27
申请号：US4898235
申请日：1935-10-30
Applicant: RCA CORP
Inventor： ZWERYKIN VLADIMIR K , MASSA JR ERNEST A
IPC: H01J43/20
CPC classification number: H01J43/20
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