Improvements in or relating to Voice Frequency Signalling Systems,申请号GB19680023488-传众专利搜索

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发明名称	Improvements in or relating to Voice Frequency Signalling Systems
摘要
申请公布号	GB1176448(A)	申请公布日期	1970.01.01
申请号	GB19680023488	申请日期	1968.05.17
申请人	NIPPON TELEGRAPH AND TELEPHONE PUBLIC CORPORATION	发明人
分类号	H04Q1/46	主分类号	H04Q1/46
代理机构		代理人
主权项
地址

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