| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 310 | | ELEMENTS OR ADJUNCTS {2} |
| 311 | DF | .~> Bed support means (e.g., support grid or plate for supporting particulate bed of contact material, etc.) |
| 312 | DF | .~> Tube element containing extended surface contact reaction means (e.g., a tube internally coated or packed with a catalyst, etc.) |