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发明名称
Improvements in or relating to collapsible projection screens
摘要
申请公布号
GB744710(A)
申请公布日期
1956.02.15
申请号
GB19530026273
申请日期
1953.09.24
申请人
JOHN MICHAEL DENTON
发明人
分类号
G03B21/58
主分类号
G03B21/58
代理机构
代理人
主权项
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