[ Drilling machines and drilling tools in the nature of a downhole drill bit for use in drilling of oil and gas wells and pumping oil by means of pressure differentials; drills, drill bits, drill heads and drill strings for use in drilling oil or gas wells ]

[ Installation, repair, and maintenance of drilling machines and drilling tools in connection with drilling oil and gas wells for others; drilling of oil or gas wells for others; installation, repair, and maintenance of pumping systems for conveying drilling tools and logging tools in connection with drilling oil or gas wells for others; installation, repair, and maintenance of drills, drill bits, drill heads, and drill strings in connection with drilling oil or gas wells for others ]