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公开(公告)号：US1964761A
公开(公告)日：1934-07-03
申请号：US69506133
申请日：1933-10-25
Applicant: RCA CORP
Inventor： JACOBUS RICHARD A
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/002
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