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公开(公告)号：US2098380A
公开(公告)日：1937-11-09
申请号：US15332837
申请日：1937-07-13
Applicant: TELEFUNKEN GMBH
Inventor： ALFRED ENGELMANN , GUNTHER WOLF
IPC: H01J3/02
CPC classification number: H01J3/025 , H01J2893/0061
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