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公开(公告)号：US2818520A
公开(公告)日：1957-12-31
申请号：US47881854
申请日：1954-12-30
Applicant: RCA CORP
Inventor： ENGSTROM RALPH W , CRAIG MILTON E , THULER OSKAR W
IPC: H01J40/06
CPC classification number: H01J40/06
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