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No TPTP formula. May not be expressible in strict first order. Economy.kif 5929-5929 Refined petroleum product is a subclass of petroleum product
No TPTP formula. May not be expressible in strict first order. Economy.kif 5933-5933 Liquefied petroleum gas is a subclass of refined petroleum product
No TPTP formula. May not be expressible in strict first order. Economy.kif 5935-5935 Petroleum lubricant is a subclass of refined petroleum product
No TPTP formula. May not be expressible in strict first order. Economy.kif 5953-5953 Asphalt is a subclass of refined petroleum product


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