Improvements in or relating to circuit arrangements for telephone installations,申请号GB19510025507-传众专利搜索

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发明名称	Improvements in or relating to circuit arrangements for telephone installations
摘要
申请公布号	GB718438(A)	申请公布日期	1954.11.17
申请号	GB19510025507	申请日期	1951.10.31
申请人	SIEMENS & HALSKE AKTIENGESELLSCHAFT	发明人
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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