Abstract: The invention relates to a method for comminuting brittle grinding material. An overall economic optimization is required of methods performing only a single grain and material bed comminution in a first comminution stage. According to the invention the first comminution stage comprises precrushing the grinding material with a relatively well defined particle size, so that following stages can be designed for said particle size and consequently it is only necessary to have a lower specific energy requirement per grinding material quantity fed through.

Abstract: An installation for the automatic reading of information applied on a code carrier on movable objects, especially on piece goods, by means of an image converter connected to an evaluation system; the code carrier arranged on the object is thereby moved through the pick-up field of the image converter in any desired angular- and width-position as well as, within a limited area of any desired height- and inclination-position; a linear semiconductor sensor with a large number of photoelements is provided as image converter in a narrow line-shaped pick-up field extending transversely to the movement direction of the object while the code carrier has an optically active coating.

Abstract: A classifier using a swirling air current has two or more scatter plates turning about a common axis at different speeds and designed for causing outward motion of feed towards baffle rings placed round and turning with the scatter plates.