| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 919 | DD | BURETTES; PIPETTES [B01L 3/02] {5} |
| 931 | DD | .~ Interchangeable or disposable dispensing tips [B01L 3/02E] {2} |
| 933 | | .~.~ Means for supplying or disposing of tips, e.g., racks or cassettes [B01L 3/02E4] |