| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 50 | DF | ANALYZER, STRUCTURED INDICATOR, OR MANIPULATIVE LABORATORY DEVICE {11} |
| 83 | DF | .~ Means for analyzing gas sample {6} |
| 86 | DF | .~.~ Including means reacting gas with color indicator {1} |
| 87 | | .~.~.~ Strip indicator |