| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 50 | DF | ANALYZER, STRUCTURED INDICATOR, OR MANIPULATIVE LABORATORY DEVICE {11} |
| 55 | DF | .~ Structured visual or optical indicator, per se {3} |
| 58 | DF | .~.~ In holder or container having special form {1} |
| 59 | | .~.~.~ Column {1} |
| 60 | DF | .~.~.~.~> Having plural-layered material |