EXCLUSION SYSTEM FOR A KEY TELEPHONE SYSTEM,申请号GB19790000694-传众专利搜索

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发明名称	EXCLUSION SYSTEM FOR A KEY TELEPHONE SYSTEM
摘要
申请公布号	GB2012523(A)	申请公布日期	1979.07.25
申请号	GB19790000694	申请日期	1979.01.09
申请人	INTERNATIONAL STANDARD ELECTRIC CORP	发明人
分类号	H04Q5/20;(IPC1-7):H04M9/00;H04M13/00	主分类号	H04Q5/20
代理机构		代理人
主权项
地址

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