… 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 … The heading includes the gas produced by underground gasification and also water gas, producer gas and similar … in the presence of steam. These mixtures are similar in composition to coal gas and are used for heating or lighting …