9 Hydrogen electrolysers for scientific, industrial, laboratory, commercial, petrochemical and/or research use; electrolysers for scientific, industrial, laboratory, commercial, petrochemical and/or research use; electrolysers for use with hydrocarbon fuels for scientific, industrial, laboratory, commercial, petrochemical and/or research use; computer software in the field of hydrogen electrolysis; electro chemical cells; computer equipment for use in electrolysis installations; electrolysers [electrolytic cells] for scientific, industrial, laboratory, commercial, petrochemical and/or research use; fuel cells; proton-exchange machines; rectifiers; current rectifiers; parts and fittings in relation to all the aforesaid