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公开(公告)号：US3371240A
公开(公告)日：1968-02-27
申请号：US47800865
申请日：1965-06-29
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： ORMSBY HARRY L
IPC: H01J19/38
CPC classification number: H01J19/38 , H01J2893/0016
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