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公开(公告)号：US3532901A
公开(公告)日：1970-10-06
申请号：US3532901D
申请日：1967-06-12
Applicant: ASEA AB
Inventor： HYLTEN-CAVALLIUS NILS , BOKSJO CARL INGVAR , OLSSON KARL-ERIK , ALGBRANT ARNE
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