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公开(公告)号：US2279941A
公开(公告)日：1942-04-14
申请号：US37622941
申请日：1941-01-27
Applicant: GEN ELECTRIC
Inventor： DUNHAM CARLTON R , FRANCIS VICTOR J
IPC: H01J61/52
CPC classification number: H01J61/52
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