William E Cook, Morton A Vodian, Otto Haunold: Multiple object capturing and processing device. Beckman Instruments, W H May, J E Vanderburgh, R S Frieman, January 22, 1985: US04495150 (38 worldwide citation)

A device for handling and washing beads. The device is attachable to a test tube rack and includes a frame, a containing slide, and a capture slide. By manipulating the slides in various combinations of positions the beads may be added to, removed from, or separately washed apart from test tubes in ...