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公开(公告)号：US1722195A
公开(公告)日：1929-07-23
申请号：US27218128
申请日：1928-04-23
Applicant: GEN ELECTRIC
Inventor： BUMSTEAD WILLIAM D , AURADA EDWARD A
IPC: H01J9/28
CPC classification number: H01J9/28
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公开(公告)号：US2034560A
公开(公告)日：1936-03-17
申请号：US75512534
申请日：1934-11-28
Applicant: GEN ELECTRIC
Inventor： BUMSTEAD WILLIAM D
IPC: H01J9/28
CPC classification number: H01J9/28
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