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公开(公告)号：US2539111A
公开(公告)日：1951-01-23
申请号：US9706949
申请日：1949-06-03
Applicant: ASEA AB
Inventor： ALGOT ARVIDSSON , SVEN-ERIK JOHANSSON
IPC: H05B37/02
CPC classification number: H05B37/029
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