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公开(公告)号：US1863398A
公开(公告)日：1932-06-14
申请号：US31804028
申请日：1928-11-08
Applicant: GEN ELECTRIC
Inventor： DOUGHERTY ROBERT H
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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