| 422 / | HD | CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING |
| 919 | DD | BURETTES; PIPETTES [B01L 3/02] {5} |
| 920 | DD | .~ Burettes, i.e., for withdrawing and redistributing liquids through different conduits [B01L 3/02B] {1} |
| 921 | | .~.~ Plunger type [B01L 3/02B2] |