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公开(公告)号：US1991479A
公开(公告)日：1935-02-19
申请号：US35092229
申请日：1929-03-29
Applicant: RCA CORP
Inventor： WILLIAMS RICHARD M
IPC: H01J17/00
CPC classification number: H01J17/00 , H01J2893/0064
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