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公开(公告)号：US2144250A
公开(公告)日：1939-01-17
申请号：US4371435
申请日：1935-10-05
Applicant: RCA CORP
Inventor： ALLEN VICTOR O , JOSEPH JOHNSON
IPC: H01J1/146
CPC classification number: H01J1/146 , Y10S428/929 , Y10S428/935 , Y10T428/12833
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