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1.发明授权
公开(公告)号：US3193057A
公开(公告)日：1965-07-06
申请号：US20494562
申请日：1962-06-25
Applicant: ASEA AB
Inventor： OLLE RUDQVIST , HENNING SCHIOTT
CPC classification number: H02P29/0022
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