| (subclass Filter Device) | Mid-level-ontology.kif 2519-2519 | |
| (subclass AbsoluteFilter Filter) | MilitaryDevices.kif 1363-1363 | |
| (subclass FuelFilter Filter) | Cars.kif 917-917 | |
| (subclass AirFilter Filter) | Cars.kif 938-938 | |
| (subclass CharcoalFilter Filter) | Cars.kif 1683-1683 |
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