(subclass PetroleumProduct Oil) | Mid-level-ontology.kif 1670-1670 | |
(subclass FossilFuel PetroleumProduct) | Mid-level-ontology.kif 1681-1681 | |
(subclass Petroleum PetroleumProduct) | Economy.kif 5684-5684 | |
(subclass RefinedPetroleumProduct PetroleumProduct) | Economy.kif 5929-5929 |