(under subclass 14) Systems, in which a main liquid stream in passing to the discharge point is modified by adding or injecting another substance, such as a gas, dissolved solid, or solid matter in suspension.
SEE OR SEARCH CLASS
137, Fluid Handling,
87.01+, for self proportioning or correlating systems, especially subclasses 111+ for plural inflows, and subclass 268 for a fluid handling system with a holder for solid material to be entrained in a flow. See the search notes thereunder.
