Improvements in sound producers,申请号GB19310032580-传众专利搜索

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发明名称	Improvements in sound producers
摘要
申请公布号	GB380651(A)	申请公布日期	1932.09.22
申请号	GB19310032580	申请日期	1931.11.24
申请人	SUBMARINE SIGNAL COMPANY	发明人
分类号	G10K9/13	主分类号	G10K9/13
代理机构		代理人
主权项
地址

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