| 摘要 |
<p>The drainage gutter (1) has elongated retainer pieces at the top edge for a grating or similar cover. Each such retainer piece (4, 5) fits against a side walling face of the edge concerned, except on the upper side. The pieces can be T-shaped bars with their stems lying on the upper side of the gutter edges and connected to them by screws (6). Effective edge protection is provided at low cost, on gutters made of asbestos cement, plastic or other materials.</p> |
