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公开(公告)号：US1951150A
公开(公告)日：1934-03-13
申请号：US48394930
申请日：1930-09-23
Applicant: GEN ELECTRIC
Inventor： HITCHCOCK WILLIAM J
IPC: H01J17/04 , H01J61/067 , H01J61/70
CPC classification number: H01J61/70 , H01J17/04 , H01J61/0672
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公开(公告)号：US1814805A
公开(公告)日：1931-07-14
申请号：US40995729
申请日：1929-11-26
Applicant: GEN ELECTRIC
Inventor： HITCHCOCK WILLIAM J
IPC: H01J31/40
CPC classification number: H01J31/40
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