| 摘要 |
<p>The surface of an indoor or outdoor horse riding arena is maintained by a tractor-drawn tool. The tool loosens, mixes, smoothes, grades, crumbles and/or compresses the surface. The tool is coupled to the tractor by a drawbar mechanism that raises or lowers the tool as required by the operator. The tool position may be regulated in the horizontal azimuth plane with respect to and behind the tractor.</p> |
