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公开(公告)号：US1475192A
公开(公告)日：1923-11-27
申请号：US55629422
申请日：1922-04-24
Applicant: GEN ELECTRIC
Inventor： MARSHALL JAMES E
IPC: H01J5/24
CPC classification number: H01J5/24 , H01J2893/0039
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公开(公告)号：US1298533A
公开(公告)日：1919-03-25
申请号：US9672716
申请日：1916-05-10
Applicant: GEN ELECTRIC
Inventor： MARSHALL JAMES E
CPC classification number: H05K13/0092
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