Explosion proof acoustic device,申请号US19530350648-传众专利搜索

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发明名称	Explosion proof acoustic device
摘要
申请公布号	US2756281(A)	申请公布日期	1956.07.24
申请号	US19530350648	申请日期	1953.04.21
申请人	PITTINGER ABRAHAM L	发明人	PITTINGER ABRAHAM L.
分类号	H04R9/06	主分类号	H04R9/06
代理机构		代理人
主权项
地址

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