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公开(公告)号：US3127470A
公开(公告)日：1964-03-31
申请号：US26117963
申请日：1963-02-26
Applicant: ASEA AB
Inventor： RAGNAR ANDERSSON ANDERS , KNUT NYLUND
IPC: H01B3/04
CPC classification number: H01B3/04 , Y10S428/906
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