| 摘要 |
The present invention relates to an electromotive chalk eraser which can prevent harmful influence of the chalk dust generated while erasing the blackboard on students and teachers. The electromotive chalk eraser of the present invention can easily and simply remove the adsorbed chalk dust therefrom to reduce the inconveniences caused in the course of re-using the chalk eraser, and it can be repeatedly used for a long time without being worn out, thus eliminating costs for exchanging old chalk erasers for new ones. |
