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公开(公告)号：US2785340A
公开(公告)日：1957-03-12
申请号：US34175653
申请日：1953-03-11
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： OKRESS ERNEST C , REED ROBERT R
IPC: H01J23/22
CPC classification number: H01J23/22
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