Differentiation of speeds,申请号US19290393359-传众专利搜索

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发明名称	Differentiation of speeds
摘要
申请公布号	US1943038(A)	申请公布日期	1934.01.09
申请号	US19290393359	申请日期	1929.09.18
申请人	TECHNIDYNE CORPORATION	发明人	PIAZZE THOMAS E.
分类号	G11B17/04	主分类号	G11B17/04
代理机构		代理人
主权项
地址

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