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公开(公告)号：US1906066A
公开(公告)日：1933-04-25
申请号：US47326630
申请日：1930-08-05
Applicant: RCA CORP
Inventor： GILLES HOLST , RICHARD SHEPHERD , LIS PIETER HENDRIK ABRAHAM VAN
IPC: H04R9/04
CPC classification number: H04R9/04
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