Improvements in or relating to telephone systems,申请号GB19400006355-传众专利搜索

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发明名称	Improvements in or relating to telephone systems
摘要
申请公布号	GB535991(A)	申请公布日期	1941.04.29
申请号	GB19400006355	申请日期	1940.04.09
申请人	ELECTRICAL RESEARCH PRODUCTS INC.	发明人
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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