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公开(公告)号：US2891304A
公开(公告)日：1959-06-23
申请号：US59138256
申请日：1956-06-14
Applicant: RCA CORP
Inventor： COLVIN ALEX D
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/0019 , Y10T428/12264 , Y10T428/12361 , Y10T428/13
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