| 摘要 |
<p>Guide threshold string made from steel comprises guide housings (1) formed on one side from a screw bolt passing through the housings and on the other side from a screw nut in the upper region of coupling units and pockets (12) of intersecting metal sheets fixed in vertical slots in a front wall (6) of one guide housing. Preferred Features: The screw nut is fixed to the inner side of a front wall of one guide housing whilst an opening is provided in a starting wall (3) of a guide housing at the height of the screw bolt.</p> |
