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公开(公告)号：US2009221A
公开(公告)日：1935-07-23
申请号：US73010434
申请日：1934-06-11
Applicant: GEN ELECTRIC
Inventor： JOHANNES BRUIJNES , PIETER SCHOUWSTRA , ENGEL BERNARD VAN
IPC: H01J61/04
CPC classification number: H01J61/04
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