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公开(公告)号：US2817572A
公开(公告)日：1957-12-24
申请号：US47846354
申请日：1954-11-17
Applicant: TELEFUNKEN GES FUR DRAHTLASE T
Inventor： ANTON WEBER
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/0019
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