DIAL TONE DETECTION ARRANGEMENT WITH A DETECTION NOTIFICATION FEATURE,申请号EP19860116160-传众专利搜索

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发明名称	DIAL TONE DETECTION ARRANGEMENT WITH A DETECTION NOTIFICATION FEATURE
摘要
申请公布号	EP0224212(A3)	申请公布日期	1989.05.03
申请号	EP19860116160	申请日期	1986.11.21
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	CROMWELL, JEFFREY ALLEN;DUCHARME, ROBERT LAWRENCE
分类号	H04M19/02;H04M3/42;H04M3/48;H04M3/54;H04Q3/58;H04Q3/62;(IPC1-7):H04Q3/58	主分类号	H04M19/02
代理机构		代理人
主权项
地址

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