| 摘要 |
<p>The element (1) has straight sections (10) arranged between a set of support points (2, 3) and another set of support points (6, 7). The sections allow positioning of primary and secondary wire meshes in two parallel planes distant from each another. A center portion of a steel wire comprises a vertical bump facing upwards so as to trap the latter set of support points. The former set of support points cooperates with the primary wire mesh, and the latter set of support points cooperates with the secondary wire mesh.</p> |
