| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 120 | DF | FOR DEODORIZING OF, OR CHEMICAL PURIFICATION OF, OR GENERATION OF, LIFE-SUSTAINING ENVIRONMENTAL GAS {3} |
| 123 | DF | .~ Including means adding material into environmental gas {2} |
| 125 | DF | .~.~ With material-heating means {1} |
| 126 | | .~.~.~ Material is combusted |