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公开(公告)号：US2506633A
公开(公告)日：1950-05-09
申请号：US70535646
申请日：1946-10-24
Applicant: RCA CORP
Inventor： ENGSTROM RALPH W , PIETENPOL WILLIAM J
IPC: H01J40/04
CPC classification number: H01J40/04
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