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公开(公告)号：US2356230A
公开(公告)日：1944-08-22
申请号：US42499241
申请日：1941-12-30
Applicant: RCA CORP
Inventor： DALE KENTNER CARROLL
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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