| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 243 | DF | PHYSICAL TYPE APPARATUS {8} |
| 255 | DF | .~ Means separating or dissolving a material constituent {3} |
| 256 | DF | .~.~ Liquid-liquid contact means {3} |
| 257 | ![]() | .~.~.~ Including pulsator, adjustable plates, or plural inlets; e.g., spraying, etc. |