Improvements in and relating to appliances for increasing audibility of sounds for partially deaf people,申请号GB19390014169-传众专利搜索

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发明名称	Improvements in and relating to appliances for increasing audibility of sounds for partially deaf people
摘要
申请公布号	GB528662(A)	申请公布日期	1940.11.04
申请号	GB19390014169	申请日期	1939.05.12
申请人	JOHN JENKIN JONES	发明人
分类号	H04R1/10	主分类号	H04R1/10
代理机构		代理人
主权项
地址

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