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1.发明授权
公开(公告)号：US3302094A
公开(公告)日：1967-01-31
申请号：US36497964
申请日：1964-05-05
Applicant: ASEA AB
Inventor： INGVAR BOKSJO CARL , GUNNAR HEDENBO ERIK
IPC: H02M7/15
CPC classification number: H02M7/15
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