Microgroove polystyrene phonograph record,申请号US19500158592-传众专利搜索

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发明名称	Microgroove polystyrene phonograph record
摘要
申请公布号	US2670308(A)	申请公布日期	1954.02.23
申请号	US19500158592	申请日期	1950.04.27
申请人	UNION CARBIDE AND CARBON CORPORATION	发明人	GROFF FRAZIER;BASSETT HOWARD D.
分类号	G11B3/58;G11B3/70	主分类号	G11B3/58
代理机构		代理人
主权项
地址

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