| 摘要 |
<p>A filament made in plastic or other flexible material is shaped in a sinuous structure formed by a longitudinal row of hooks each having a coupling head from which the top and bottom arms extend backwards. A bridge shaped part links together two adjacent top arms while each bottom arm has a locking part which is joined with a similar part of an adjacent arm by a connecting part. Between this part and the bottom arm in the area of each hook, the fastening element has a reduced thickness, and is preferably flattened.</p> |
