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公开(公告)号：US2841735A
公开(公告)日：1958-07-01
申请号：US49435655
申请日：1955-03-15
Applicant: PHILIPS CORP
Inventor： GEORGE RYBAKOFF
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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