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公开(公告)号：US1800735A
公开(公告)日：1931-04-14
申请号：US39888729
申请日：1929-10-11
Applicant: ASEA AB
Inventor： JARL KUUSINEN , ARLE YTTERBERG
IPC: H02J3/46
CPC classification number: H02J3/46 , Y10T307/718
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