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公开(公告)号：US2110911A
公开(公告)日：1938-03-15
申请号：US73718534
申请日：1934-07-27
Applicant: TELEFUNKEN GMBH
Inventor： MAX KNOLL , ERNST SOMMERFELD
IPC: H01J29/58
CPC classification number: H01J29/58
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