Improvements in or relating to telephone circuits for two-way transmission,申请号GB19550035403-传众专利搜索

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发明名称	Improvements in or relating to telephone circuits for two-way transmission
摘要
申请公布号	GB797770(A)	申请公布日期	1958.07.09
申请号	GB19550035403	申请日期	1955.12.09
申请人	PHILIPS ELECTRICAL INDUSTRIES LIMITED	发明人
分类号	H04B3/20	主分类号	H04B3/20
代理机构		代理人
主权项
地址

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