42 Scientific and technological services, namely, geological prospecting, geological surveys, oil-field and gas-field engineering surveys, underwater exploration; scientific, technological and industrial research, namely, geological research, technical research, namely, technical research regarding underwater exploration, chemical research, mechanical research, and scientific and technological design relating to the aforementioned services, namely, design of drilling machinery; industrial analysis services, namely, chemical analysis, analysis for oil-field and gas-field exploration and exploitation, technical analysis of drilling samples from underground drilling for exploitation of natural resources, technical consultancy services concerning geological prospecting, exploration and surveys; engineering; design and development of computer hardware and software; design, updating and maintenance of computer software; rental of scientific, nautical, weighing, measuring, checking supervision apparatus and instruments, namely, computers, computer systems, computer programmes, data processors, sensing and signaling devices for measurement of minerals, fluids and hydrocarbons, compasses, marine depth finders, wavemeters, sonars, sounding lines, scales, laser measuring systems, pressure gauges, thermometers, densimeters, densitometers, hydrometers, hydrocarbon meters, slope indicators, alarm monitoring systems, video and audio monitors, sensors, namely, acceleration sensors, oil level sensors, testing apparatus, namely, carbon testers, computers and computer programmes; quality control for others