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公开(公告)号：US2100746A
公开(公告)日：1937-11-30
申请号：US4865835
申请日：1935-11-07
Applicant: RCA CORP
Inventor： MILLER HENRY J , SCHAFER ELWOOD W
IPC: H01J7/18
CPC classification number: H01J7/183
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