37 Construction services including drilling and laying of oil and natural gas pipelines; drilling of oil wells; construction of oil and natural gas processing and compression facilities; construction of oil and natural gas distribution facilities; automobile service station services for oil changes, alignments, general repair and maintenance; contracting and consultancy services related to scientific technical, engineering and project management, technical studies, design, construction, maintenance and repair of all kinds of works and buildings, procurement, inspection, expediting, and management of construction relating to oil and natural gas exploration, extraction, compression, refining and distribution facilities