.~> Having heat emitting tube or flue within or traversing shaft chamber
(under the class definition) Apparatus comprising a chamber having a substantially vertical axis to which material is fed at an elevated level for gravitation generally downwardly across a heating surface or through a heating gas.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
165+, for a gravity flow type drier. See the search class note to Class 34 in the class definition of Class 432 for the line between Classes 34 and 432.
202, Distillation: Apparatus,
120+, for a vertical retort in which a material is heated to drive off a condensible component.
266, Metallurgical Apparatus, 154, for a metallurgical shaft furnace having a fume arrester and subclasses for a 197+ metallurgical shaft furnace. See the search class notes in the class definition of Class 432 for the line between Classes 266 and 432.