Chemicals for industrial purposes for use in ceramics for the gas and oil industry; Ceramic powders and granules used in manufacturing wear-resistant and corrosion-resistant ceramic components for the oil and gas industry, primarily composed of silicon carbide, titanium diboride, tungsten carbide, silicon nitride, boron carbide, titanium diboride, zirconia, alumina, mullite, spinel and mixed oxides, or primarily composed of composites, namely, tungsten carbide-cobalt, tungsten carbide-nickel, tungsten carbide-iron, titanium diboride-iron, titanium diboride-copper, and titanium carbide-iron; unprocessed plastics including ceramic-reinforced plastics

Parts of machines, namely, filters, filtering and separation devices for the separation of sand and rock particles when recovering liquids or gases from rock wells such as petroleum, natural gas and ground water (not for use in providing drinking water); armatures, valves, chokes, seals, bearings, tubes, nozzles and slide valves, all as parts of machines for oil production machines, gas production machines, oil refining machines, gas refining machines, and as parts of machines for explorating and developing of petroleum and natural gas, and as parts of machines for deep-well drillings

Installation, maintenance, repair and cleaning of filtering and separation devices for the separation of sand and rock particles when recovering liquids and gases, especially petroleum, natural gas and ground water; installation, maintenance, repair and cleaning of dosing and shut-off devices, armatures, valves, chokes, bearings and seals for oil recovery facilities, natural gas recovery facilities, petroleum production facilities, natural gas production facilities and for oil and gas exploration, exploitation and production facilities and for deep-well drillings

Services of technical designers, engineers, physicists, and chemists, namely, design and testing of new products for others, engineering services, research and development services in connection with physics, scientific research and development services, and chemist services; Engineering services and scientific research and development services, namely, conducting technical project studies and providing technical consultancy in the field of filtering and separation devices for the separation of sand and rock particles when recovering liquids or gases from rock wells, especially petroleum, natural gas and ground water and for dosing and shut-off devices, armatures, valves, chokes, bearings and seals for oil recovery facilities, natural gas recovery facilities, petroleum production facilities, natural gas production facilities and for oil and gas exploration, exploitation and production facilities and for deep-well drillings