Optical device for indicating correct operating speed of phonograph turntables,申请号US19440551565-传众专利搜索

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发明名称	Optical device for indicating correct operating speed of phonograph turntables
摘要
申请公布号	US2418651(A)	申请公布日期	1947.04.08
申请号	US19440551565	申请日期	1944.08.28
申请人	MAUSSHARDT MILTON R	发明人	MAUSSHARDT MILTON R.
分类号	G11B23/42	主分类号	G11B23/42
代理机构		代理人
主权项
地址

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