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公开(公告)号：US2948791A
公开(公告)日：1960-08-09
申请号：US74013158
申请日：1958-06-05
Applicant: ASEA AB
Inventor： SVEN JONASSON , WALTER PUCHER
IPC: H01H33/75
CPC classification number: H01H33/75
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