| (=> (instance ?C ElectricalConductor) (exists (?S) (and (subclass ?S ConductorSubstance) (material ?S ?C)))) |
engineering.kif 826-831 |
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| (subclass ElectricalConductor ElectricalComponent) | engineering.kif 825-825 | ElectricalConductor est une sous-classe de ElectricalComponent |
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