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公开(公告)号：US2091031A
公开(公告)日：1937-08-24
申请号：US858235
申请日：1935-02-28
Applicant: RCA CORP
Inventor： DE BOER JAN HENDRIK , CORNELIS TEVES MARTEN , HENDRIK LEMS
IPC: H01J9/12
CPC classification number: H01J9/12
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