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公开(公告)号：US1814357A
公开(公告)日：1931-07-14
申请号：US37417429
申请日：1929-06-27
Applicant: RCA CORP
Inventor： IRVING WOLFF , OLSON HARRY F
IPC: G10K11/28
CPC classification number: G10K11/28
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