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公开(公告)号：US2820177A
公开(公告)日：1958-01-14
申请号：US55626855
申请日：1955-12-29
Applicant: ASEA AB
Inventor： ENGSTROM GUNNAR P , HARRY FORSSELL
IPC: H02M1/04
CPC classification number: H02M1/045
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2.发明授权
公开(公告)号：US3021471A
公开(公告)日：1962-02-13
申请号：US75731358
申请日：1958-08-26
Applicant: ASEA AB
Inventor： ENGSTROM GUNNAR P
IPC: H02M7/15
CPC classification number: H02M7/151 , H02M7/15 , Y10T307/582 , Y10T307/729
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