APPARATUS CHARACTERIZED BY COMPOSITION OR TREATMENT THEREOF(E.G., SURFACE FINISH, SURFACE COATING):
(under the class definition) A collection of art in which an apparatus is specified in terms of its material of construction or in terms of a treatment of it.
SEE OR SEARCH CLASS
118, Coating Apparatus, for apparatus for forming coatings of single-crystal* products.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
240+, for chemical reaction of a specific material of construction (and not provided for in subclasses 129+).
