(subclass WMDWeaponsResearchFacility StationaryArtifact) | WMD.kif 637-637 | WMDWeaponsResearchFacility est une sous-classe de artefact stationnaire |
(subclass NuclearWeaponResearchFacility WMDWeaponsResearchFacility) | WMD.kif 664-664 | NuclearWeaponResearchFacility est une sous-classe de WMDWeaponsResearchFacility |