Digital closed network constructed from a telephone exchange and a key telephone system and signal transmission method of the digital closed network,申请号GB20030019186-传众专利搜索

发明名称	Digital closed network constructed from a telephone exchange and a key telephone system and signal transmission method of the digital closed network
摘要
申请公布号	GB0319186(D0)	申请公布日期	2003.09.17
申请号	GB20030019186	申请日期	2003.08.15
申请人	TRANSPACE TECH CO LTD	发明人
分类号	H04M3/00;H04L12/66;H04M7/00;H04M9/00;H04M11/00	主分类号	H04M3/00
代理机构		代理人
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