37 Extraction of oil; Maintenance and repair services for oil pipelines; Maintenance of construction equipment; Maintenance of tools and equipment used in the oil field industry; Oil and gas industrial machine cleaning services; Oil extraction services; Oil pumping and extraction; Consulting services in the field of repair and maintenance of mining equipment; Installation, maintenance and repair of oil field equipment; Installation, maintenance and repair of drilling and mining tools; Machinery maintenance and repair; Machinery installation, maintenance and repair; Maintenance and cleaning of mining equipment; Maintenance and repair of mining equipment; Oil well casing, tubing, and drill pipe installation; Providing information related to the installation, maintenance and repair of oil field tools and equipment; Providing technical information in the field of mining extraction; Repair and maintenance of mining equipment; Repair or maintenance of metalworking machines and tools; Technical consulting related to the installation of oil and gas equipment, control systems, and machinery