37 Construction, repair, and maintenance of electrical utility transmission, distribution, substation and related facilities for others; construction, repair, and maintenance of pipeline systems, infrastructure, onshore contract rotary drilling, production and other hydrocarbon related facilities for others; construction, repair, and maintenance of oil and gas wells and other oil and gas related facilities for others; construction project management in the field of electrical utility transmission, distribution, substation and related facilities for others; construction project management for others in the field of electrical utility transmission, distribution, substation and related facilities; construction project management in the field of pipeline systems, onshore contract rotary drilling, production and other hydrocarbon related facilities for others; construction project management of oil and gas related facilities for others; Maintenance of electrical utility transmission, distribution, substation and related facilities and equipment for others; maintenance of oil and gas related facilities and equipment for others; technical support services, namely, technical advice related to the installation of electrical utility transmission, distribution, substation and related facilities; technical support services, namely, technical advice related to the installation of gas and liquid pipeline facilities