| 摘要 |
The device (1) has two uprights (2) and a plane (5) or level that is placed transversely between the two uprights. A bar (6) is fixed at the uprights, and another plane (8) of widened support or another level includes two wings (9, 10) that extend posteriorly on both sides of the bar. The bar is made of single-piece that defines the set of wings. The bar is arranged with a polygonal section, and an upper side of the device is arranged with a central support part. |
