Curt Herzstark: Apparatus for distribution of liquid test samples through various test stations. BNA Augustin & Co KG, Frishauf Holtz Goodman & Woodward, May 19, 1981: US04268477 (76 worldwide citation)

Samples of blood from hundreds of patients are held in test tubes mounted in twenty endless chains of the same number of links, each chain being mounted on a chain-holder keyed so as to be insertable for mounting on only one sector of a rotary disk. A locking member by which the chain is closed must ...