SECURITY SHEET COMPRISING WATERMARK
Provided is a security sheet comprising: a first sheet including a first watermark; a second sheet; and an intermediate sheet disposed between the first sheet and the second sheet. The first sheet and the second sheet are transparent or translucent. The intermediate sheet includes a pattern layer on...
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Main Authors | , , |
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Format | Patent |
Language | English Korean |
Published |
01.07.2020
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Subjects | |
Online Access | Get full text |
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