(subclass Sign ContentBearingObject) | Mid-level-ontology.kif 17119-17119 | Sign is a subclass of content bearing object |
(subclass Sign DisplayArtifact) | Mid-level-ontology.kif 17120-17120 | Sign is a subclass of display artifact |
(subclass Sign DataDisplayDevice) | Media.kif 851-851 | Sign is a subclass of data display device |