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经营范围
发明名称
PROJECTION SCREEN
摘要
A projection screen comprises a flexible covering forming the picture projecting surface which is stretched to a planar form by an inflatable stiffening structure of flexible material enclosed by the covering.
申请公布号
US3720455(A)
申请公布日期
1973.03.13
申请号
USD3720455
申请日期
1971.08.02
申请人
SAHLIN J,SW
发明人
SAHLIN J,SW
分类号
G03B21/56;(IPC1-7):G03B21/56
主分类号
G03B21/56
代理机构
代理人
主权项
地址
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