Improvements in or relating to telephone systems,申请号GB19480031010-传众专利搜索

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发明名称	Improvements in or relating to telephone systems
摘要
申请公布号	GB660667(A)	申请公布日期	1951.11.07
申请号	GB19480031010	申请日期	1948.11.30
申请人	AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED	发明人	GALVIN JOHN LESLIE
分类号	H04M3/523	主分类号	H04M3/523
代理机构		代理人
主权项
地址

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