| 摘要 |
The non-permanent marker board eraser apparatus provides a basic design and construction that exposes minimal moving parts to erasure debris. The two-spaced apart horizontal guide rails are u-shaped and open outwardly. The vertical traveling eraser sections are motor powered and provide for drive from either upper first guide rail or the lower second guide rail via a rubberized wheel that fits within either of the two guide rails. The control buttons provide for selective eraser marker board contact. Each board travel is accompanied by automatic eraser return to a rest position outside of or to the edge of the board's marking surface. Cleaning fluid is also dispensed through the erasers. |
