(subclass PetroleumProduct Oil) | Mid-level-ontology.kif 1677-1677 | PetroleumProduct e' uma sub-classe de Oil |
(subclass FossilFuel PetroleumProduct) | Mid-level-ontology.kif 1688-1688 | FossilFuel e' uma sub-classe de PetroleumProduct |
(subclass Petroleum PetroleumProduct) | Economy.kif 5684-5684 | Petroleum e' uma sub-classe de PetroleumProduct |
(subclass RefinedPetroleumProduct PetroleumProduct) | Economy.kif 5929-5929 | RefinedPetroleumProduct e' uma sub-classe de PetroleumProduct |