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经营范围
发明名称
Cinematograph screen
摘要
申请公布号
US1819776(A)
申请公布日期
1931.08.18
申请号
US19280317210
申请日期
1928.11.05
申请人
THE DA-LITE SCREEN COMPANY, INC.
发明人
HECK JACOB C.
分类号
G03B21/56
主分类号
G03B21/56
代理机构
代理人
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地址
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