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公开(公告)号：US1930326A
公开(公告)日：1933-10-10
申请号：US53226231
申请日：1931-04-23
Applicant: GEN ELECTRIC
Inventor： THOMAS RALPH B
IPC: H01K1/70
CPC classification number: H01K1/70
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公开(公告)号：US2006231A
公开(公告)日：1935-06-25
申请号：US74586634
申请日：1934-09-28
Applicant: GEN ELECTRIC
Inventor： MALLOY FRANK J , THOMAS RALPH B
IPC: H01J5/24
CPC classification number: H01J5/24 , H01J2893/0039
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公开(公告)号：US1832751A
公开(公告)日：1931-11-17
申请号：US36327229
申请日：1929-05-15
Applicant: GEN ELECTRIC
Inventor： THOMAS RALPH B
CPC classification number: H01J5/58 , Y10T29/49876
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