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1.发明授权
公开(公告)号：US3243684A
公开(公告)日：1966-03-29
申请号：US24343162
申请日：1962-12-10
Applicant: ASEA AB
Inventor： AKE EKSTROM , LENNART FAXO
IPC: H02M1/14
CPC classification number: H02M1/146
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