IMPROVEMENTS IN OR RELATING TO DEVICES FOR THE DETERRENCE OF NUISANCE TELEPHONE CALLS,申请号GB19870006236-传众专利搜索

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发明名称	IMPROVEMENTS IN OR RELATING TO DEVICES FOR THE DETERRENCE OF NUISANCE TELEPHONE CALLS
摘要
申请公布号	GB2202411(B)	申请公布日期	1991.01.02
申请号	GB19870006236	申请日期	1987.03.17
申请人	* SYSTEC ENGINEERING CONSULTANTS LIMITED	发明人	JOHN DAVID * WILLIAMS
分类号	H04M1/663	主分类号	H04M1/663
代理机构		代理人
主权项
地址

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