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公开(公告)号：US3526780A
公开(公告)日：1970-09-01
申请号：US64118067
申请日：1967-05-25
Applicant: ASEA AB
Inventor： UHLMANN ERICH , DANFORS PER
CPC classification number: H02J3/36 , Y02E60/60 , Y10T307/707
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