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发明名称
SECURITY PRINTING
摘要
<p>A security print proof against photocopying in which a primary image is rendered in a density modulation of pairs of lines, and a secondary image is applied to said primary image by altering the relationship between lines in a pair.</p>
申请公布号
WO2003068522(P1)
申请公布日期
2003.08.21
申请号
GB2003000571
申请日期
2003.02.08
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发明人
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