B PERFORMING OPERATIONS; TRANSPORTING
B01 PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
B01L CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
2300/00 Additional constructional details
B01L2300/08 Geometry, shape and general structure
B01L2300/0809 rectangular shaped
B01L2300/0816 Cards, e.g. flat sample carriers usually with flow in two horizontal directions