(=> (instance ?I ResistorElement) (exists (?S) (and (subclass ?S InsulatorSubstance) (material ?S ?I)))) |
engineering.kif 855-860 | |
(subclass ResistorElement ElectricDevice) | engineering.kif 834-834 | |
(subclass ResistorElement ElectricalComponent) | engineering.kif 854-854 |