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公开(公告)号：US2402030A
公开(公告)日：1946-06-11
申请号：US53504344
申请日：1944-05-11
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： DORRIS ROBERT C
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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