DIRECT LINE TELEPHONE SYSTEM,申请号GB19730058710-传众专利搜索

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发明名称	DIRECT LINE TELEPHONE SYSTEM
摘要
申请公布号	GB1509172(A)	申请公布日期	1978.04.26
申请号	GB19730058710	申请日期	1973.12.19
申请人	DROP J;BENHAM K	发明人
分类号	H04M9/04;(IPC1-7):H04M9/00	主分类号	H04M9/04
代理机构		代理人
主权项
地址

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