| 摘要 |
<p>The spacer (6) has a base (26) which is attached at the stand through two holes (28). The free ends (23,24) of the blades (20,21) contain holes (25) which are intended for the attachment of spacer to the guide rail. Each hole (28) in the operating area of the spacer has a broader area (30) and a narrow area (32).</p> |
