| 摘要 |
<p>The central part (1) and adjoining side parts (2) of the device combine to form a single piece made from metal, preferably aluminium, copper or lead. Weights (3) are mounted on the side parts and the weight of these is used to hold the device in place on top of the roof covering (6). The side parts and weights are pleated. The central part is designed to be placed on top of the ridge batten (5) and the side parts are designed to be placed on top of a roof covering.</p> |
