B PERFORMING OPERATIONS; TRANSPORTING
B01 PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
B01L CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
3/00 Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
B01L3/02 Burettes; Pipettes
B01L3/021 Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids