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发明名称
Projection screen
摘要
申请公布号
US2278073(A)
申请公布日期
1942.03.31
申请号
US19390251895
申请日期
1939.01.20
申请人
SMITH HARKNESS THOMAS
发明人
HARKNESS THOMAS SMITH
分类号
G03B21/56
主分类号
G03B21/56
代理机构
代理人
主权项
地址
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