Resonant chamber for microphones,申请号US19450612451-传众专利搜索

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发明名称	Resonant chamber for microphones
摘要
申请公布号	US2518805(A)	申请公布日期	1950.08.15
申请号	US19450612451	申请日期	1945.08.24
申请人	FRANK MASSA	发明人	MASSA FRANK
分类号	H04R1/22	主分类号	H04R1/22
代理机构		代理人
主权项
地址

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