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公开(公告)号：US3412200A
公开(公告)日：1968-11-19
申请号：US60027366
申请日：1966-12-08
Applicant: ASEA AB
Inventor： LARS-GORAN VIRSBERG , LARS-GORAN LAURELL
IPC: H01B9/02
CPC classification number: H01B9/027
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