Twin unit stethoscope headphones,申请号GB19520031526-传众专利搜索

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发明名称	Twin unit stethoscope headphones
摘要
申请公布号	GB732388(A)	申请公布日期	1955.06.22
申请号	GB19520031526	申请日期	1952.12.12
申请人	DICTAPHONE CORPORATION	发明人
分类号	H04R1/10	主分类号	H04R1/10
代理机构		代理人
主权项
地址

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