Improvements in or relating to telephone systems,申请号GB19280032864-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	GB325005(A)	申请公布日期	1930.02.10
申请号	GB19280032864	申请日期	1928.11.09
申请人	AUTOMATIC TELEPHONE MANUFACTURING COMPANY LIMITED;CHARLES GILLINGS;WILLIAM HENRY PAULETT	发明人
分类号	H04Q3/42	主分类号	H04Q3/42
代理机构		代理人
主权项
地址

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