Conical diaphragm for loud speakers,申请号US19290339557-传众专利搜索

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发明名称	Conical diaphragm for loud speakers
摘要
申请公布号	US1815987(A)	申请公布日期	1931.07.28
申请号	US19290339557	申请日期	1929.02.13
申请人	PETERSON CHARLES W	发明人	PETERSON CHARLES W.
分类号	H04R7/12	主分类号	H04R7/12
代理机构		代理人
主权项
地址

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