Improvements relating to sound amplifying devices,申请号GB19330030367-传众专利搜索

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发明名称	Improvements relating to sound amplifying devices
摘要
申请公布号	GB421012(A)	申请公布日期	1934.12.12
申请号	GB19330030367	申请日期	1933.11.01
申请人	MORIZO IWASA	发明人
分类号	A61F11/00	主分类号	A61F11/00
代理机构		代理人
主权项
地址

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