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公开(公告)号：US2173347A
公开(公告)日：1939-09-19
申请号：US1364035
申请日：1935-03-29
Applicant: RCA CORP
Inventor： QUINTRELL WALKER LOUIS EDWARD , EARNSHAW BENHAM WILFRID
IPC: H01J29/52
CPC classification number: H01J29/52
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