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公开(公告)号：US1955397A
公开(公告)日：1934-04-17
申请号：US56741831
申请日：1931-10-07
Applicant: RCA CORP
Inventor： GEEL WILLEM CHRISTIAAN VAN , HENDRIK EMMENS
IPC: H01L21/16
CPC classification number: H01L21/16
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