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发明名称
PROJECTION SCREEN CONSTRUCTION
摘要
申请公布号
CA791977(A)
申请公布日期
1968.08.13
申请号
CAD791977
申请日期
申请人
DA-LITE SCREEN COMPANY
发明人
JOSEPH BERNAT
分类号
主分类号
代理机构
代理人
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