| 摘要 |
<p>This chip comprises a central part (6, 17, 24), produced in a heavy material, in the shape of a circular disc, a first part made from synthetic material forming a ring (7, 19) surrounding the central part and covering over the latter at least over a part of each of its faces, and a second part made from synthetic material (9, 23) covering over the ring of the first part made from synthetic material on each of its faces and over at least a part of its edge. <IMAGE></p> |
