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公开(公告)号：US2999186A
公开(公告)日：1961-09-05
申请号：US34728453
申请日：1953-04-07
Applicant: RCA CORP
Inventor： PRITCHARD DALTON H , DAVID NELSON MORRIS
IPC: H04N9/28
CPC classification number: H04N9/28
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