| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 26036-26036 | 子類 Earphone and Device |
| No TPTP formula. May not be expressible in strict first order. | ComputerInput.kif 502-502 | 子類 Earphone and ElectricSpeakerDevice |
| No TPTP formula. May not be expressible in strict first order. | ComputerInput.kif 503-503 | 子類 Earphone and 可穿戴物品 |
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