| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 50 | DF | ANALYZER, STRUCTURED INDICATOR, OR MANIPULATIVE LABORATORY DEVICE {11} |
| 68.1 | DF | .~ Means for analyzing liquid or solid sample {11} |
| 78 | DF | .~.~ Including means for pyrolysis, combustion, or oxidation {2} |
| 79 | | .~.~.~ Biological, chemical, or total oxygen demand (i.e., BOD, COD, TOD) |