| 摘要 |
<p>A sheet of security paper (1) comprising transparent or translucid zones of substantially zero opacity consists of at least one layer of paper having at least one zone (3, 3a^-, 3b^-) of zero thickness and at least one strip (4) of transparent or translucid material enveloped in the layer of paper so that the strip of transparent material lies opposite the zone of zero thickness. Application to papers for banknotes and cheques.</p> |
