… Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water process gas generators, with or without their purifiers. …
Explanatory notes
… Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water … compounds, etc., and sometimes reheated or cooled. For this purpose, the generators are often fitted with purifiers … diffusing apparatus, electric, designed for non-therapeutic purposes (e.g., for industrial uses, for the ozonisation of …