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公开(公告)号：US1941687A
公开(公告)日：1934-01-02
申请号：US18207927
申请日：1927-04-08
Applicant: FOREST RADIO COMPANY DE
Inventor： HUNTER JR FREDERICK L
IPC: H01J21/36
CPC classification number: H01J21/36
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公开(公告)号：US1612440A
公开(公告)日：1926-12-28
申请号：US74661624
申请日：1924-10-29
Applicant: FOREST RADIO COMPANY DE
Inventor： HUNTER JR FREDERICK L
IPC: H01J19/42
CPC classification number: H01J19/42 , H01J2893/0002
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