An improved projection screen unit,申请号GB19510008759-传众专利搜索

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发明名称	An improved projection screen unit
摘要
申请公布号	GB691230(A)	申请公布日期	1953.05.06
申请号	GB19510008759	申请日期	1951.04.16
申请人	MAX SCHUMANN	发明人
分类号	G03B21/56	主分类号	G03B21/56
代理机构		代理人
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