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公开(公告)号：US2686390A
公开(公告)日：1954-08-17
申请号：US28273552
申请日：1952-04-16
Applicant: RCA CORP
Inventor： JOHN WILLIAMS BERNARD , HENRY HUGHES RICHARD
IPC: H01J9/26
CPC classification number: H01J9/263
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