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公开(公告)号：US1869130A
公开(公告)日：1932-07-26
申请号：US50140830
申请日：1930-12-10
Applicant: GEN ELECTRIC
Inventor： KARL BRABAND
IPC: H01J13/10
CPC classification number: H01J13/10 , H01J2893/0077
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