Improvements relating to acoustic instruments,申请号GB19290038298-传众专利搜索

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发明名称	Improvements relating to acoustic instruments
摘要
申请公布号	GB337264(A)	申请公布日期	1930.10.30
申请号	GB19290038298	申请日期	1929.12.13
申请人	CELESTION LIMITED;CYRIL FRENCH	发明人
分类号	H04R1/28	主分类号	H04R1/28
代理机构		代理人
主权项
地址

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