Loud speaker construction,申请号US19340720087-传众专利搜索

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发明名称	Loud speaker construction
摘要
申请公布号	US2006857(A)	申请公布日期	1935.07.02
申请号	US19340720087	申请日期	1934.04.11
申请人	THE ROLA COMPANY	发明人	ENGHOLM BERNARD A.
分类号	H04R9/04	主分类号	H04R9/04
代理机构		代理人
主权项
地址

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