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公开(公告)号：US2921209A
公开(公告)日：1960-01-12
申请号：US55733656
申请日：1956-01-04
Applicant: RCA CORP
Inventor： BLOOM ARNOLD W , WOLKE ROY K
IPC: H01J19/42
CPC classification number: H01J19/42 , H01J2893/0005
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