Improvements in or relating to circuit-arrangements for use in automatic signalling systems of telephone systems,申请号GB19500025998-传众专利搜索

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发明名称	Improvements in or relating to circuit-arrangements for use in automatic signalling systems of telephone systems
摘要
申请公布号	GB673788(A)	申请公布日期	1952.06.11
申请号	GB19500025998	申请日期	1950.10.25
申请人	PHILIPS ELECTRICAL INDUSTRIES LIMITED	发明人
分类号	H04M15/10;H04Q1/36	主分类号	H04M15/10
代理机构		代理人
主权项
地址

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