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公开(公告)号：US2441987A
公开(公告)日：1948-05-25
申请号：US54383944
申请日：1944-07-07
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： BOYER JOHN L , ROSE HERBERT A
CPC classification number: H01J13/34 , H01J13/48 , H01J2893/0087
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