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发明名称
Contrast control device for a slit-type copier exposure system
摘要
申请公布号
US4912505(A)
申请公布日期
1990.03.27
申请号
US19890327879
申请日期
1989.03.23
申请人
THE MEAD CORPORATION
发明人
LARSON, BRENT D.
分类号
G03G15/04;G03B27/50;G03B27/54;G03B27/72;G03G15/043;G03G15/047
主分类号
G03G15/04
代理机构
代理人
主权项
地址
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