(subclass EngineCoolingSystem PhysicalSystem) | Cars.kif 2135-2135 | Engine cooling system is a subclass of physical system |
(subclass LiquidEngineCoolingSystem EngineCoolingSystem) | Cars.kif 2156-2156 | Water cooling system is a subclass of engine cooling system |
(subclass AirEngineCoolingSystem EngineCoolingSystem) | Cars.kif 2176-2176 | Air cooling system is a subclass of engine cooling system |