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公开(公告)号：US3139120A
公开(公告)日：1964-06-30
申请号：US69542357
申请日：1957-11-08
Applicant: RCA CORP
Inventor： BEEZER EARL F , ROY MAHR
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0026
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