| No TPTP formula. May not be expressible in strict first order. | Cars.kif 1190-1190 | Generator is a subclass of machine |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 1756-1756 | Windmill is a subclass of generator |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 1204-1204 | Alternator is a subclass of generator |
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