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公开(公告)号：US2981863A
公开(公告)日：1961-04-25
申请号：US71478658
申请日：1958-02-12
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： SCHNEEBERGER ROBERT J , CASTLE JR JOHN G
IPC: H01J31/18
CPC classification number: H01J31/18
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