An improved security system,申请号GB19780034773-传众专利搜索

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发明名称	An improved security system
摘要
申请公布号	GB2031249(A)	申请公布日期	1980.04.16
申请号	GB19780034773	申请日期	1978.08.26
申请人	MARCONI CO LTD	发明人
分类号	G07C1/20;(IPC1-7):H04B7/26;G08B25/00	主分类号	G07C1/20
代理机构		代理人
主权项
地址

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