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经营范围
发明名称
Improvements in or relating to optical projection screens
摘要
申请公布号
GB729323(A)
申请公布日期
1955.05.04
申请号
GB19520012523
申请日期
1952.05.17
申请人
ELECTRIC & MUSICAL INDUSTRIES LIMITED
发明人
TAYLOR JOHN HARRY
分类号
G03B21/60
主分类号
G03B21/60
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