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公开(公告)号：US3487699A
公开(公告)日：1970-01-06
申请号：US3487699D
申请日：1968-01-25
Applicant: ASEA AB
Inventor： PETTERSSON LARS-OLAV , SPANGBERG RUNE
CPC classification number: H01H43/005 , G04F3/06 , Y10T74/114
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