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公开(公告)号：US2509865A
公开(公告)日：1950-05-30
申请号：US76902747
申请日：1947-08-16
Applicant: ASEA AB
Inventor： ERIC HEDSTROM SVEN , ROBERT SVENSSON
IPC: G05B1/02
CPC classification number: G05B1/025
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