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发明名称
Halftone screen
摘要
申请公布号
US1858011(A)
申请公布日期
1932.05.10
申请号
US19300425969
申请日期
1930.02.05
申请人
GUEOVJIAN JOHN G
发明人
GUEOVJIAN JOHN G.
分类号
F16D65/14;G03F5/10
主分类号
F16D65/14
代理机构
代理人
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