Sales of machines and machine tools, motors and engines (except for land vehicles), machine coupling and transmission components (except for land vehicles), pressure reduction valves, generators of electricity, turbines other than for land vehicles, pressure regulators, speed governors for machines, engines and motors, pumps, hydraulic engines and motors, hydraulic turbines, measuring and checking (supervision) apparatus and instruments, apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, solenoid valves, pressure indicators for valves, apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes, water distribution and water supply installations, gas generators, regulating accessories for water or gas apparatus and for water or gas pipes, and water, oil or gas purifying apparatus and machines; sales of parts and accessories to the aforementioned goods