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No TPTP formula. May not be expressible in strict first order. Mid-level-ontology.kif 2493-2493 Optical device is a subclass of device
No TPTP formula. May not be expressible in strict first order. Mid-level-ontology.kif 2505-2505 Eye glass is a subclass of optical device
No TPTP formula. May not be expressible in strict first order. Mid-level-ontology.kif 2510-2510 Lens is a subclass of optical device
No TPTP formula. May not be expressible in strict first order. Mid-level-ontology.kif 2515-2515 Microscope is a subclass of optical device


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