Voice frequency signaling circuit,申请号US19470729255-传众专利搜索

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发明名称	Voice frequency signaling circuit
摘要
申请公布号	US2585019(A)	申请公布日期	1952.02.12
申请号	US19470729255	申请日期	1947.02.18
申请人	INTERNATIONAL STANDARD ELECTRIC CORPORATION	发明人	LALANDE MARC A.
分类号	H04Q1/442	主分类号	H04Q1/442
代理机构		代理人
主权项
地址

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