Speed control of phonograph motors,申请号US19440521528-传众专利搜索

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发明名称	Speed control of phonograph motors
摘要
申请公布号	US2490093(A)	申请公布日期	1949.12.06
申请号	US19440521528	申请日期	1944.02.08
申请人	DICTAPHONE CORPORATION	发明人	ROBERTS FREDERICK W.;TREVITT JOHN H.
分类号	G11B19/28	主分类号	G11B19/28
代理机构		代理人
主权项
地址

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