| 摘要 |
<p>The panel has a rubber or plastics sheet incorporating magnetic particles, on which a number of information elements (5) are positioned. Each has a ferromagnetic surface so that the information elements (5) are held in position by magnetic attraction. The rear of the panel is formed by a ferromagnetic plate (1) and has an upstanding edge forming a frame (3) around the entire periphery of the panel. The magnetic sheet is divided into a number of strips (3) stretched between the opposing edges of the frame (2), with display elements (5) placed along the entire length of each strip (3), so that the entire surface of the panel is covered. Pref. some of the display elements (5) are printed with respective letters or numbers on their front face, while others are blank.</p> |
