Biogas generating installations, being machines for generating biogas; machines for converting biogas into electric energy; slurry blender machines for processing biomass for use in the gas industry; machine parts, namely, pumps, stirrers, valves; fuel catalysts, in particular, for use in biogas generating machines; machines for the generation, storage and transport of energy, in particular, biogas; biogas generating machines; gas processing machines; gas cleaning machine plants; gas treatmen...