Waste energy utilising installations; installations for generating power from natural sources; power units; pneumatically or hydraulically driven machines; air compressors, rotary air compressors, screw air compressors and compressors for refrigerating machines; electrical welding machines; machines for construction purposes; rock and concrete breaking machines; machines for use in the construction and repair of roads; excavators, electric current generators; pumps; steam engines; snow making machines; drying machines; parts and fittings for all the aforesaid goods; all included in Class 7.;