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公开(公告)号：US2539540A
公开(公告)日：1951-01-30
申请号：US58332245
申请日：1945-03-17
Applicant: ASEA AB
Inventor： HENRIK IDAR KARL , GUNNAR LINDAHL
IPC: B21B37/54
CPC classification number: B21B37/54
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