Improvements relating to wired intercommunication systems,申请号GB19450006636-传众专利搜索

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发明名称	Improvements relating to wired intercommunication systems
摘要
申请公布号	GB581715(A)	申请公布日期	1946.10.22
申请号	GB19450006636	申请日期	1945.03.16
申请人	FERRANTI LIMITED;JAMES WOOD	发明人
分类号	H04M9/00	主分类号	H04M9/00
代理机构		代理人
主权项
地址

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