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公开(公告)号：US2220688A
公开(公告)日：1940-11-05
申请号：US14502037
申请日：1937-05-27
Applicant: TELEFUNKEN GMBH
Inventor： FRITZ SCHROTER , MAX KNOLL , WERNER KLUGE , HELLMUTH ETZOLD
IPC: H01J31/12
CPC classification number: H01J31/12
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