TELEPHONE SIGNALLING TEST SYSTEM,申请号GB19790013574-传众专利搜索

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发明名称	TELEPHONE SIGNALLING TEST SYSTEM
摘要
申请公布号	GB2021356(B)	申请公布日期	1982.05.12
申请号	GB19790013574	申请日期	1979.04.19
申请人	NORTHERN TELECOM LTD	发明人
分类号	H04M3/24;H04Q1/38;H04Q1/45;(IPC1-7):H04M3/22;H04M5/20	主分类号	H04M3/24
代理机构		代理人
主权项
地址

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