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发明名称
Portable picture screen supporting means
摘要
申请公布号
US2272269(A)
申请公布日期
1942.02.10
申请号
US19400355966
申请日期
1940.09.09
申请人
DA-LITE SCREEN COMPANY, INC.
发明人
HECK JOHN T.
分类号
G03B21/58
主分类号
G03B21/58
代理机构
代理人
主权项
地址
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