| 摘要 |
A spiral staircase comprises a central supporting element (1) and a plurality of steps (2) which are connected to the supporting element (1) at a first end (2a), there being two types of steps (21, 22) positioned in an alternating fashion, of which a first type of step (21) is substantially "L"-shaped and a second type of step (22) is substantially arrow-shaped. |
