(under subclass 7) Apparatus in which the moving film support is a rotary drum or disk.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
108+, for apparatus including a hollow drum rotating about an axis through, over, by, or in which the material is carried to be treated, and subclass 173 for apparatus of the gravity-flow type with shelf to shelf or zigzag treated material flow in which there is a rotary shelf or stirrer.
165, Heat Exchange,
89+, for a heated or cooled rotary drum not specialized to evaporation.
492, Roll or Roller, for a roll, per se, not elsewhere provided for, and see the notes thereunder.
