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公开(公告)号：US2429203A
公开(公告)日：1947-10-21
申请号：US43502042
申请日：1942-03-17
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： FREEMAN GEORGE A , CONLIN HOWARD J
IPC: H01J9/395
CPC classification number: H01J9/395
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