Improvements relating to optical lenses of the fresnel type,申请号GB19500004058-传众专利搜索

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发明名称	Improvements relating to optical lenses of the fresnel type
摘要
申请公布号	GB692569(A)	申请公布日期	1953.06.10
申请号	GB19500004058	申请日期	1950.02.17
申请人	ELECTRIC & MUSICAL INDUSTRIES LIMITED	发明人	PEARCE RALPH REGINALD
分类号	G02B3/08	主分类号	G02B3/08
代理机构		代理人
主权项
地址

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