422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
1 | DF | PROCESS DISINFECTING, PRESERVING, DEODORIZING, OR STERILIZING {15} |
22 | DF | .~ Using direct contact with electrical or electromagnetic radiation {2} |
24 | .~.~ Ultraviolet |