| 摘要 |
<p>A roller shutter lath which is provided with articulation means 3,4 along both longitudinal edges and flat front and rear surfaces between the articulation means. The front surface of the lath is provided with at least one, but preferably two parallel, longitudinal ribs 7 projecting from the front surface. The lath may be cold-formed by passing a strip of mild steel through a rolling mill. The front surface of the lath may be coated with a thin film of plastics. <IMAGE></p> |
