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经营范围
发明名称
Motion picture screen
摘要
申请公布号
US1949487(A)
申请公布日期
1934.03.06
申请号
US19300447610
申请日期
1930.04.26
申请人
RAVEN ALBERT L
发明人
RAVEN ALBERT L.
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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