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1.发明授权
公开(公告)号：US3487455A
公开(公告)日：1969-12-30
申请号：US3487455D
申请日：1968-04-08
Applicant: ASEA AB
Inventor： LAURELL LARS G , MANDT ARNE
CPC classification number: H01B9/025 , H01B9/027 , Y10S411/986
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