Improvements in or relating to electrical signalling systems,申请号GB19370026971-传众专利搜索

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发明名称	Improvements in or relating to electrical signalling systems
摘要
申请公布号	GB503497(A)	申请公布日期	1939.04.05
申请号	GB19370026971	申请日期	1937.10.05
申请人	AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED	发明人
分类号	H04Q1/44	主分类号	H04Q1/44
代理机构		代理人
主权项
地址

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