| 摘要 |
<p>The U-shaped rail (2) has slots (3) centered to one another in its side parts. Such slots have an approx. 'J' shape, the stem of which slopes slightly looking from below and upwards towards the bottom of the rail. Its lower part extends forwards to the edge of the side parts turned away from the bottom. In the slots is a pin (6) which passes through the column (4), when the rail and sign are fitted around it.</p> |
