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公开(公告)号：US1820943A
公开(公告)日：1931-09-01
申请号：US24057127
申请日：1927-12-16
Applicant: RCA CORP
Inventor： GILLES HOLST , URK AREND THOMAS VAN , ROELOF VERMEULEN
IPC: H04R11/00
CPC classification number: H04R11/00
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