… Coal gas, water gas, producer gas and similar gases, other than petroleum gases and other gaseous …
Explanatory notes
… 27.05 ‑ C oal gas, water gas, producer gas and similar gases, other than petroleum gases and other gaseous hydrocarbons. Coal gas is obtained by the distillation of coal in the absence of air, usually in gas … of gases formed by cracking or reforming of mineral oils, petroleum gases or natural gases, usually in the …