Improvements in or relating to arrangements for determining the free or busy state of a line in a telecommunication system,申请号GB19580031216-传众专利搜索

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发明名称	Improvements in or relating to arrangements for determining the free or busy state of a line in a telecommunication system
摘要
申请公布号	GB879174(A)	申请公布日期	1961.10.04
申请号	GB19580031216	申请日期	1958.09.30
申请人	SIEMENS & HALSKE AKTIENGESELLSCHAFT	发明人
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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