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公开(公告)号：US2220181A
公开(公告)日：1940-11-05
申请号：US14957637
申请日：1937-06-22
Applicant: AEG
Inventor： EBERHARD STEUDEL , JURG JOHANNESSON
IPC: H01J29/48
CPC classification number: H01J29/481
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