Subclass 1/28: Fibrous raw materials or their mechanical treatment (beaters D21D 1/00) by dividing raw materials into small particles, e.g. fibres (breaking-up or cutting wood or the like by dry methods B27L; disintegrating peat C10F 7/02; obtaining fibres mechanically for spinning from rags, peat, or the like D01B) by wet methods, by the use of steam Disintegrating in mills (in general B02C) Dressers for mill stones, combined with the mill