| 摘要 |
<p>A wheel-holder for a roller-skate is in one piece and of laminated plastic. It is of U-shaped, laminated plastic on a mould layer by layer. The outermost reinforcing layers are formed by carbon-fibre cloth and parallel strip of the same material. The core consists of a number of layers of polyester-fibre cloth, the whole being satd. in hardening plastic.</p> |
