Coal gas, water gas, producer gas and similar gases, other than petroleum gases and other gaseous hydrocarbons

CPC v2.1 class (Coal gas, water gas, producer gas and similar gases, other than petroleum gases and other gaseous hydrocarbons) within 'Coal gas, water gas, producer gas and similar gases, other than petroleum gases and other gaseous hydrocarbons'. UN Central Product Classification grouping of related products at this level.