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公开(公告)号：US2058878A
公开(公告)日：1936-10-27
申请号：US65515033
申请日：1933-02-04
Applicant: GILLES HOLST , TELLEGEN BERNARDUS D H
Inventor： GILLES HOLST , TELLEGEN BERNARDUS D H
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/001
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