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公开(公告)号：US2490542A
公开(公告)日：1949-12-06
申请号：US57197845
申请日：1945-01-09
Applicant: GEN ELECTRIC
Inventor： CARLEY READ JOHN
IPC: H01J13/20
CPC classification number: H01J13/20 , H01J2893/0092
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公开(公告)号：US1802185A
公开(公告)日：1931-04-21
申请号：US36987429
申请日：1929-06-10
Applicant: GEN ELECTRIC
Inventor： CARLEY READ JOHN
IPC: H01J13/20
CPC classification number: H01J13/20 , H01J2893/0092
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