Improvements in a method and apparatus for the amplification of sounds received from and of sounds transmitted to a telephone hand combination,申请号GB19490019729-传众专利搜索

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发明名称	Improvements in a method and apparatus for the amplification of sounds received from and of sounds transmitted to a telephone hand combination
摘要
申请公布号	GB678380(A)	申请公布日期	1952.09.03
申请号	GB19490019729	申请日期	1949.07.27
申请人	LASZLO NAMENYI-KATZ	发明人
分类号	H04M1/215	主分类号	H04M1/215
代理机构		代理人
主权项
地址

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