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公开(公告)号：US1799743A
公开(公告)日：1931-04-07
申请号：US43883030
申请日：1930-03-25
Applicant: GEN ELECTRIC
Inventor： HENRICUS GOOSKENS , PIETER LEYDENS
IPC: H01J5/24
CPC classification number: H01J5/24 , H01J2893/0039
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