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公开(公告)号：US2813216A
公开(公告)日：1957-11-12
申请号：US35009253
申请日：1953-04-21
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： DAILEY RUTH M , HAROLD RAPAPORT
IPC: H01J7/18
CPC classification number: H01J7/186
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