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公开(公告)号：US2136292A
公开(公告)日：1938-11-08
申请号：US7702736
申请日：1936-04-29
Applicant: DENES GABOR
Inventor： DENES GABOR
IPC: H01J17/00
CPC classification number: H01J17/00 , H01J2893/006
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