| 摘要 |
<p>The device has a body (10) with an upper surface (11a), and a positioning section (12) that is designed at the upper surface in a deepened or projected shape for precise positioning of a retainer at the upper surface by mesh with the retainer. The positioning section has a spherical or conical surface, and has a shape, which produces a close interference with an interference section formed at the retainer. The upper surface of the body is formed at a flange (11), which extends from the body.</p> |
