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公开(公告)号：US1812312A
公开(公告)日：1931-06-30
申请号：US36150629
申请日：1929-05-08
Applicant: ASEA AB
Inventor： ARLE YTTERBERG
IPC: H01H9/54
CPC classification number: H01H9/54
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公开(公告)号：US1793272A
公开(公告)日：1931-02-17
申请号：US36150529
申请日：1929-05-08
Applicant: ASEA AB
Inventor： ARLE YTTERBERG
IPC: H02P9/24
CPC classification number: H02P9/24
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