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公开(公告)号：US2518953A
公开(公告)日：1950-08-15
申请号：US4915448
申请日：1948-09-14
Applicant: ASEA AB
Inventor： SORENSEN HARALD M , BJORN STEPHENSEN
CPC classification number: H05B39/09 , H01F38/04 , Y10T307/74
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