| 摘要 |
<p>The eraser for white- or blackboards comprises an inner and an outer cupular member (2, 1), each of which has a bottom with two substantially straight, parallel sides from each of which a side wall (10, 3) extends, the inner member (2) being designed to be received and retained in the outer member (1) in a closed position so that the side walls (3, 10) are pairwise juxtaposed in such a manner that the two members form between them a substantially closed hollow space. The eraser further includes means (5, 6) for retaining the two members (1, 2) against opening of the hollow space in a half-open, mutual position in which there is a distance between the respective pairwise adjacent side walls (3, 10).</p> |
