37 Oil pumping and extraction; pumping crude oil; oil well drilling; drilling for crude oil; water or oil well boring; oil extraction services; drilling and pumping of oil; oil and gas drilling; installation of apparatus for the production of oil; drilling of deep oil or gas wells; construction of oil drilling rigs; construction of oil pipelines; shipbuilding; underwater construction; construction of structures for the production of crude oil; construction of structures for the transportation of crude oil; construction of structures for the storage of crude oil; construction of structures for the storage of natural gas; construction of structures for the production of natural gas; construction of structures for the transportation of natural gas; installation, construction, maintenance, servicing and repair of energy and power generating apparatus, equipment and installations; installation, maintenance and repair of apparatus for processing metals; installation, maintenance and repair of metalworking machines; repair of installations for use in metal production, metal processing and metal working; providing information relating to the repair or maintenance of metalworking machines and tools; repair or maintenance of metalworking machines and tools and providing information relating thereto; installation, maintenance and repair of systems, machinery and apparatus for working and processing metals and sheet metal; repair of biogas plants and machines; installation of gas supply and distribution apparatus; installation, maintenance and repair of apparatus for supplying gas; pipeline construction and maintenance; machinery installation, maintenance and repair; installation, maintenance and repair of air blowers; maintenance of plumbing installations; maintenance of industrial machinery; maintenance of vehicles and machines; maintenance and cleaning of mining equipment; installation, maintenance and repair of industrial machinery; installation, maintenance and repair of measuring apparatus; installation, maintenance and repair of vacuum pumps; installation, maintenance and repair of oil separators; repair and maintenance of gas and electricity installations; repair and maintenance of mining machines; construction, maintenance, cleaning and repair services all in the field of oil pipelines; construction, repair, maintenance and installation services all in the field of oil pipelines; consultancy relating to installation, maintenance and repair services all in the field of oil pipelines; providing information relating to the repair or maintenance of industrial oil pumps; repair or maintenance of chemical plants; servicing, cleaning and repair of chemical apparatus, namely, chemical processing machines; providing information relating to the repair or maintenance of chemical plants; repair or maintenance of chemical plants and providing information relating thereto; providing information relating to the repair or maintenance of chemical processing machines and apparatus; repair or maintenance of chemical processing machines and apparatus; repair or maintenance of chemical processing machines and apparatus and providing information relating thereto