Improvements relating to telephone systems,申请号GB19330032198-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	GB428622(A)	申请公布日期	1935.05.16
申请号	GB19330032198	申请日期	1933.11.18
申请人	SIEMENS BROTHERS & CO., LIMITED;DOUGLAS PERCY LONG	发明人
分类号	H04Q3/42	主分类号	H04Q3/42
代理机构		代理人
主权项
地址

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