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公开(公告)号：US2648839A
公开(公告)日：1953-08-11
申请号：US18799250
申请日：1950-10-02
Applicant: RCA CORP
Inventor： FORD JOHN R , PEARSON BOLLINGER WALDON
CPC classification number: H01Q21/06 , G01S1/02 , G01S13/913
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