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公开(公告)号：US1740397A
公开(公告)日：1929-12-17
申请号：US22655327
申请日：1927-10-17
Applicant: GEN ELECTRIC
Inventor： WERNER FEHSE , WILHELM HAGEN
IPC: H01J5/32
CPC classification number: H01J5/32
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公开(公告)号：US2135696A
公开(公告)日：1938-11-08
申请号：US951435
申请日：1935-03-05
Applicant: GEN ELECTRIC
Inventor： HEINRICH BAUMHAUER , WERNER FEHSE
IPC: H01J61/34
CPC classification number: H01J61/34
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