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公开(公告)号：US2197625A
公开(公告)日：1940-04-16
申请号：US22381838
申请日：1938-08-09
Applicant: RCA CORP
Inventor： CORNELIS TEVES MARTEN , ELINE KRAAK-CRAMER , MENZE BANDRINGA
IPC: H01J29/18
CPC classification number: H01J29/18
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