Improvements in or relating to telephone systems,申请号GB19490019525-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	GB682242(A)	申请公布日期	1952.11.05
申请号	GB19490019525	申请日期	1949.07.25
申请人	AUTOMATIC ELECTRIC LABORATORIES, INC.	发明人
分类号	H04M3/32	主分类号	H04M3/32
代理机构		代理人
主权项
地址

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