| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 129 | DF | CHEMICAL REACTOR {28} |
| 224 | DF | .~ Including internal mixing or stirring means {2} |
| 230 | DF | .~.~ Thermosyphon or differential density mixing means; e.g., means internally recycling reaction mass via differential density pumping, etc. {1} |
| 231 | | .~.~.~ Gas sparger type mixing means submerged in liquid reactant |