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公开(公告)号：US2458013A
公开(公告)日：1949-01-04
申请号：US58007745
申请日：1945-02-27
Applicant: ASEA AB
Inventor： GUNNAR MALMBERG TORE
IPC: H01L21/105 , H01L21/108 , H01L21/12
CPC classification number: H01L21/108 , H01L21/105 , H01L21/12
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