| 摘要 |
<p>A grass protection system has first and second grass protection blocks and a first interlock means (25,26;25',26') for preventing or substantially preventing vertical movement of the first grass protection block relative to the second grass protection block. The system also has a second interlock means (27,28,27') for preventing the first grass protection block moving apart from the second grass protection block to such a distance as would dis-engage the interlocking between the first and second grass protection blocks <IMAGE></p> |
