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公开(公告)号：US2813217A
公开(公告)日：1957-11-12
申请号：US27710652
申请日：1952-03-18
Applicant: RCA CORP
Inventor： JOHN PRAGER HANS , ALBERT WISSOLIK RAYMOND
IPC: H01J17/56
CPC classification number: H01J17/56
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