Improvements relating to telephone systems,申请号GB19560011983-传众专利搜索

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发明名称	Improvements relating to telephone systems
摘要
申请公布号	GB854611(A)	申请公布日期	1960.11.23
申请号	GB19560011983	申请日期	1956.04.19
申请人	SIEMENS EDISON SWAN LIMITED	发明人	STALLWORTHY FRANK ALLEN
分类号	H04M7/10;H04Q1/446	主分类号	H04M7/10
代理机构		代理人
主权项
地址

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