Sound recording oscilloscope,申请号US19350013986-传众专利搜索

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发明名称	Sound recording oscilloscope
摘要
申请公布号	US2137768(A)	申请公布日期	1938.11.22
申请号	US19350013986	申请日期	1935.03.30
申请人	LEONARD COUGHLAN HAROLD	发明人	COUGHLAN HAROLD LEONARD
分类号	G11B7/00	主分类号	G11B7/00
代理机构		代理人
主权项
地址

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