An improved optical viewing apparatus for use in reading print or the like,申请号GB19310004956-传众专利搜索

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发明名称	An improved optical viewing apparatus for use in reading print or the like
摘要
申请公布号	GB357472(A)	申请公布日期	1931.09.24
申请号	GB19310004956	申请日期	1931.02.17
申请人	JOHN BARROW YOUNG;JOHN DOUGLAS YOUNG;PERCY CHASTON YOUNG	发明人
分类号	G02B27/02	主分类号	G02B27/02
代理机构		代理人
主权项
地址

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