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公开(公告)号：US2880352A
公开(公告)日：1959-03-31
申请号：US56613956
申请日：1956-02-17
Applicant: RCA CORP
Inventor： JACK HART
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0025
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