(under the class definition) Subject matter wherein material is mixed by directing a jet or spray of one material into contact with a free-falling stream of another material so as to intermix the material of the jet and the stream.
(1) Note. The free-falling stream of material may be solid or liquid. The material is considered free-falling if it is unconfined or substantially uninfluenced in its motion by any adjacent surfaces or the like during its fall through a gas.
