| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 2519-2519 | Filter is a subclass of device |
| No TPTP formula. May not be expressible in strict first order. | MilitaryDevices.kif 1363-1363 | Absolute filter is a subclass of filter |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 917-917 | Fuel filter is a subclass of filter |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 938-938 | Air filter is a subclass of filter |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 1683-1683 | Charcoal filter is a subclass of filter |
|
|