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公开(公告)号：US1982373A
公开(公告)日：1934-11-27
申请号：US58927432
申请日：1932-01-27
Applicant: GEN ELECTRIC
Inventor： GRAY CLINKER HILDA , DAVIES LEONARD J
IPC: H01J29/16
CPC classification number: H01J29/16
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