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公开(公告)号：US3304529A
公开(公告)日：1967-02-14
申请号：US43653265
申请日：1965-03-02
Applicant: ASEA AB
Inventor： HAAKON FORWALD , LAURI SAVOLAINEN , SAMUEL BERG
CPC classification number: H01H33/165 , H01C1/16 , H01C7/12
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