| http://www.w3.org/ns/prov#value | - ired value for thevolumetric air flow.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a diagrammatic side view of a spinning preparation installation having two carding machines and including an apparatus according to the invention with a generalised circuit diagram;FIG. 2 is a generalised circuit diagram of an apparatus according to the invention having a differential pressure measurement element, spe
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