7 Machines and installations for use in oil drilling, namely, drilling rig mechanization machines and devices, drilling rig mechanical handling machines and devices, oil-well and gas-well drilling machines and devices, oil-well and gas-well pumping machines and devices, oilfield wellhead machines and devices, and oil and gas compression machines and devices; oil and gas production equipment, namely, drilling rig mechanization machines and devices, drilling rig mechanical handling machines and devices, oil-well and gas-well drilling machines and devices, oil-well and gas-well pumping machines and devices, and oil and gas compression machines and devices; subsea installations, namely, drilling rig mechanization machines and devices, drilling rig mechanical handling machines and devices, oil-well and gas-well pumping machines and devices, oil-well and gas-well drilling machines and devices, and oil and gas compression machines and devices; refining installations, namely, oil refining machines, and gas refining machines and devices; pumps, namely, electric pumps, centrifugal pumps, oil-well pumps, gas-well pumps, pumps for use in oil and gas production, pumps being parts of machines and engines and motors, oil drain pumps, submersible pumps, hydraulic pumps, choke and manifold industrial pumps being parts of oilfield wellhead machines, and high pressure pumps for use in oil or gas well hydraulic fracturing operations; compressors, namely, centrifugal compressors, air compressors, gas compressors, oil compressors, compressors for use in the extraction, processing and transportation of oil and gas, compressors being parts of machines and engines and motors, and turbocompressors; coolers, namely, oil coolers for engines, coolers being parts of machines, oil and gas coolers for machines and compression systems, anti-surge coolers, discharge coolers, and oil and gas heat exchangers; bearings, namely, engine bearings, machine parts in the nature of roller bearings, and machine parts in the nature of bearings for oil and gas applications; stators, being parts of machines; motors, namely, alternating current servo motors, direct current motors, stepper motors, hydraulic motors, and asynchronous motors not for land vehicles; gears, namely, gears for machines; separators other than for vehicles, namely, oil separators, gas separators, and downhole oil separators for submersible pumps