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公开(公告)号：US2465451A
公开(公告)日：1949-03-29
申请号：US76902847
申请日：1947-08-16
Applicant: ASEA AB
Inventor： ERIC HEDSTROM SVEN , ARNE SODERHOLM
CPC classification number: G05B11/016 , H03F9/00 , H03F9/04
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