Transmission system for sound carrying currents,申请号US19300460882-传众专利搜索

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发明名称	Transmission system for sound carrying currents
摘要
申请公布号	US1919719(A)	申请公布日期	1933.07.25
申请号	US19300460882	申请日期	1930.06.13
申请人	PROGRAM SERVICE COMPANY	发明人	HARRIS DONALD B.;KNAUSS ORVILLE W.
分类号	H04H20/81	主分类号	H04H20/81
代理机构		代理人
主权项
地址

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