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公开(公告)号：US2233917A
公开(公告)日：1941-03-04
申请号：US24628438
申请日：1938-12-17
Applicant: RCA CORP
Inventor： DE BOER JAN HENDRIK , THEODORUS SCHEERMAN LEONARDUS
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0023
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