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公开(公告)号：US3359481A
公开(公告)日：1967-12-19
申请号：US38465864
申请日：1964-07-23
Applicant: ASEA AB
Inventor： LENNART BJORK
CPC classification number: H02M7/151 , H02M1/081 , H02M7/15 , H02M7/1557
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