Piston rings; mechanical seals; engine ducts being machine and aircraft engine parts; valves beings parts of machines; valves as machine components; valves being parts of engines; hydraulic linear actuators; engine bearings; bearings, as parts of machines; roller bearings for machines; fuel and air mixture regulators being parts of internal combustion engines; regulators being parts of machines

Aircraft engine repair and maintenance; aircraft repair and maintenance; aircraft part repair and maintenance