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公开(公告)号：US2878345A
公开(公告)日：1959-03-17
申请号：US51224655
申请日：1955-05-31
Applicant: ASEA AB
Inventor： HAAKON FORWLAD
IPC: H01H33/867 , H01H33/96
CPC classification number: H01H33/96
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