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公开(公告)号：US1850981A
公开(公告)日：1932-03-22
申请号：US75259124
申请日：1924-11-28
Applicant: RADIO INVENTIONS INC
Inventor： POTTER DONLE HAROLD
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
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公开(公告)号：US1789673A
公开(公告)日：1931-01-20
申请号：US9845126
申请日：1926-03-30
Applicant: RADIO INVENTIONS INC
Inventor： POTTER DONLE HAROLD
IPC: H03F1/50
CPC classification number: H03F1/50
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