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公开(公告)号：US2429301A
公开(公告)日：1947-10-21
申请号：US56424244
申请日：1944-11-20
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： WIMPY EDGAR K , WERNER LEO C
IPC: H01J21/08
CPC classification number: H01J21/08
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