37 Building and construction services; building and construction project management; plant and engineering construction services; construction of industrial facilities including processing plants and equipment; building and construction project management; construction supervision and management services; retrofitting of industrial plants and facilities; gas and oil drilling; mining extraction; civil engineering consultancy (construction); civil engineering underwater construction services; installation of oil production apparatus; installation of oil exploration apparatus; cleaning services; consultancy services relating to building construction; pipeline repair services; civil engineering maintenance services; electrical appliance installation, maintenance and repair services; installation, maintenance and repair of fire and gas detection and alarm systems and fire protection apparatus; pump installation, maintenance and repair services; maintenance, repair, upgrade and overhaul of compressors, pumps, generators and rotating equipment; underwater repair services; rental of plant and equipment for repair purposes; installation, construction, maintenance, servicing and repair of energy and power generating apparatus equipment and installations; civil infrastructure construction; information, advisory and consultancy services relating to the aforesaid services