(subclass RecreationOrExerciseDevice Device) | Mid-level-ontology.kif 2374-2374 | |
(subclass AerobicExerciseDevice RecreationOrExerciseDevice) | Mid-level-ontology.kif 8228-8228 | |
(subclass AnaerobicExerciseDevice RecreationOrExerciseDevice) | Mid-level-ontology.kif 8232-8232 |