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公开(公告)号：US2573319A
公开(公告)日：1951-10-30
申请号：US12525249
申请日：1949-11-03
Applicant: ASEA AB
Inventor： LUDWIG DREYFUS , ERIK ERIKSSON KARL
IPC: H05B6/34
CPC classification number: H05B6/34 , H05B2213/02
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