against mechanical damage or dirt, e.g. guard covers of stairs

Full Title

Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work (conveying in general B65G; lifting devices B66; working stone-like materials B28D; measuring instruments G01) > Safety or protective measures preventing damage to building parts or finishing work during construction (as auxiliary structures for scaffolds E04G, ) > against mechanical damage or dirt, e.g. guard covers of stairs