| http://www.w3.org/ns/prov#value | - By designing the perforation openings so that they are equidistant from each other, with the distance being, for example, in the region of a few cm, and in particular less than 10 cm, the variability of the positioning of the air showers can be improved while at the same time the hollow profile is simple to produce.According to a further embodiment, the supply channel further comprises a cover dev
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