Improvements in or relating to electric signalling systems,申请号GB19290021557-传众专利搜索

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发明名称	Improvements in or relating to electric signalling systems
摘要
申请公布号	GB336572(A)	申请公布日期	1930.10.13
申请号	GB19290021557	申请日期	1929.07.12
申请人	AUTOMATIC TELEPHONE MANUFACTURING COMPANY LIMITED;GEORGE ARTHUR BURNS	发明人
分类号	H04M11/04	主分类号	H04M11/04
代理机构		代理人
主权项
地址

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