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公开(公告)号：US2266665A
公开(公告)日：1941-12-16
申请号：US68503333
申请日：1933-08-14
Applicant: RCA CORP
Inventor： SUMMERS FRANK E
IPC: H01J1/34
CPC classification number: H01J1/34 , H01J2201/3426
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