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1.Phase and frequency converter including a plurality of polygon connected phase branches 失效
Title translation: 相位和频率转换器包括多个多边形连接的相位分支-
公开(公告)号:US2989712A
公开(公告)日:1961-06-20
申请号:US69909957
申请日:1957-11-26
Applicant: ASEA AB
Inventor: ULRIK KRABBE
IPC: H01F27/245
CPC classification number: H01F27/245
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3.
公开(公告)号:US2567383A
公开(公告)日:1951-09-11
申请号:US71242046
申请日:1946-11-26
Applicant: ASEA AB
Inventor: ULRIK KRABBE , SVEN-ERIC HEDSTROM
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公开(公告)号:US2477988A
公开(公告)日:1949-08-02
申请号:US76977747
申请日:1947-08-21
Applicant: ASEA AB
Inventor: ULRIK KRABBE
IPC: H02P9/32
CPC classification number: H02P9/32
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