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公开(公告)号：US3379817A
公开(公告)日：1968-04-23
申请号：US45816565
申请日：1965-05-24
Applicant: ASEA AB
Inventor： SIGVARD SUNDELL
IPC: H05B7/152
CPC classification number: H05B7/152 , Y02P10/256 , Y02P10/259
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