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公开(公告)号：US2135290A
公开(公告)日：1938-11-01
申请号：US15405037
申请日：1937-07-16
Applicant: GEN ELECTRIC
Inventor： LOEBE WALTER W , GUSTAV MULLER , KURT WEINMANN
IPC: H01J5/24
CPC classification number: H01J5/24 , H01J2893/0039
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