| 摘要 |
<p>The invention defines a method of producing a lottery ticket with card stock material which has been subjected to an upsetting treatment after the application thereto of an image to be concealed by an opaque coating 19, so that the relief of the image ist concealed, and the image cannot be identified without the moving of the coating. The upsetting is preferably carried out by passing the stock material between nip rollers (18, 20).</p> |
