| 摘要 |
<p>The unit has a sealed container with a powderised adhesive material, an upper transparent plate, and a movable writing implement, engaging on the plate. The instrument is moved plane-parallel to the transparent plate by guides actuated from outside. The sealed container additionally contains a tool, consisting of a magnetic material, associated with the writing implement. The tool is used to move an element, which consists of magnetic or magnetiseable material, and is placed externally onto the transparent plate, or the container base.</p> |
