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经营范围
发明名称
Improvements in or relating to projection screens
摘要
申请公布号
GB541808(A)
申请公布日期
1941.12.12
申请号
GB19400009986
申请日期
1940.06.07
申请人
JOHN LESLIE STABLEFORD;SYDNEV BELTON HARRISON SWINGLER
发明人
分类号
G03B21/58
主分类号
G03B21/58
代理机构
代理人
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