(under subclass 422) Apparatus including rotating drums in which material is subjected to gaseous currents, so that the heaviest constituents of the material may settle or remain as a stratum, while the lighter constituents either form relatively displaced strata or are removed by the gaseous currents.
SEE OR SEARCH THIS CLASS, SUBCLASS:
152, (see (1) Note thereto for the line).
SEE OR SEARCH CLASS
241, Solid Material Comminution or Disintegration, appropriate subclasses, especially
54, for rotary drum comminutors having a gaseous current therethrough.
