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公开(公告)号：US1454592A
公开(公告)日：1923-05-08
申请号：US43571821
申请日：1921-01-07
Applicant: RCA CORP
Inventor： VELDE HAROLD ROBERT CORBY VAN , FU RNIVAL JOHN MEGARRY
CPC classification number: G01S1/02
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