Systems of piping for apparatus relating to this class used in a house having ventilating structure combined therewith.
SEE OR SEARCH THIS CLASS, SUBCLASS:
219+, for means to ventilate a sewer.
252.1+, for a flush closet bowl support, coupling, seal, or fastener.
SEE OR SEARCH CLASS
137, Fluid Handling, for fluid handling apparatus in general, see particular
357+, for fluid handling devices combined with building structure.
138, Pipes and Tubular Conduits.
285, Pipe Joints or Couplings, 125.1+, for multiple outlet fittings, subclasses 134.1+ for a U-type fitting, and subclass 179 for elbow fittings of general utility.
