[Class : 7] Mechanical Power Generation Plants And Heat Production Plants, Especially Gas And Combination Power Plants, Steam Power Plants, Solar, Hybrid And Geothermical Power Plants, Each Of Them Mainly Containing Gas, Turbines, Steam Turbines, Compressors, Expanders, Blowers, Heat Exchangers, Valves, Boilers, Pipes And Generators[Class : 9] Electrical Control Devices And Instruments And Control Facilities Composed Thereof For Mechanical Power Generation Plants And Heat Production Plants Included In Class 07[Class : 37] Repair, Service, Maintenance And Installation Of Mechanical Power Generation Plants And Heat Production Plants; Conducting Of Performances Enhancing Alterations For The Purpose Of Modernisation Of Mechanical Power Generation Plants And Heat Production Plants