7 Electricity generating apparatus, namely, electric generators, and machines for the production of hydrogen, namely, electrolysis machines for generating hydrogen; machines for generating hydrogen and oxygen from water and/or renewable electricity by electrolysis; machines and mechanical installations for synthesizing methane, methanol, ammonia and other hydrogen derivatives; machines and mechanical installations for transporting hydrogen and hydrogen derivatives including methane, methanol and ammonia, namely, blowing machines for the compression, exhaustion, and transport of gases