ListNSG – Nuclear-related dual-use equipment, materials, software and related technology (Part 2) – INFCIRC/254/Rev.13/Part 2 Entries in this group 4.B.1. [No longer used – since 23 June 2017]4.B.2. Hydrogen-cryogenic distillation columns having all of the following characteristics:4.B.3. [No longer used – since 14 June 2013]