1
Industrial gases for use in the welding industry; Industrial gases for use in food processing; Hydrogen
37
Maintenance and repair of energy generating installations; Maintenance, servicing and repair of power generating apparatus and installations; Repair of power generating apparatus and installations; Installation of electrical and generating machinery; Mains laying; Repair or maintenance of gasoline station equipment; Fueling of hydrogen gas for vehicles
39
Distribution of gas; Gas supplying [distribution]; Heat supplying [distribution]; Electricity distribution; Distribution of heat; Distribution of energy; Storage of energy and fuels
40
Gas production services; Generation of gas and electricity; Electricity generating; Energy production
42
Technical design and planning of pipelines for gas, water and waste water; Engineering services relating to energy supply systems; Technical design services relating to heating installations; Engineering services in the field of energy technology; Engineering services in the field of electrical power and natural gas production; Advisory services relating to energy efficiency; Conducting technical project studies; Construction drafting; Research in the field of technology provided by engineers