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11.
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公开(公告)号:US2197341A
公开(公告)日:1940-04-16
申请号:US23316638
申请日:1938-10-04
Applicant: RCA CORP
Inventor: HENDRIK JONKER JOHAN LODEWIJK
IPC: H03F1/33
CPC classification number: H03F1/33
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公开(公告)号:US2092881A
公开(公告)日:1937-09-14
申请号:US67804033
申请日:1933-06-28
Applicant: RCA CORP
Inventor: HENDRIK JONKER JOHAN LODEWIJK , WILHELM ALBRICHT
CPC classification number: H03H7/0146 , H03F3/02
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