Extraction machines for exhaust gases for chemical processing; shut-off valves being parts of machines; gate valves being parts of machines; conveyers being machines; conveyors being machines and belts for conveyors; bucket conveyors being machines; Archimedean screws being screw pumps; dust removing installations for cleaning purposes; cyclones; electric driving motors for machines; regulators being parts of machines; systems for generating hydrogen, namely, electrolysis machines for generat...