Improvements in or relating to telephone systems,申请号GB19370001629-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	GB489107(A)	申请公布日期	1938.07.19
申请号	GB19370001629	申请日期	1937.01.19
申请人	AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED;OWEN AVIS PEARCE	发明人
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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