| (subclass ShipRegister ContentBearingObject) | Transportation.kif 1106-1106 | Ship register is a subclass of content bearing object |
| (subclass NationalShipRegister ShipRegister) | Transportation.kif 1121-1121 | National ship register is a subclass of ship register |
| (subclass InternalShipRegister ShipRegister) | Transportation.kif 1168-1168 | Internal ship register is a subclass of ship register |
| (subclass OffshoreShipRegister ShipRegister) | Transportation.kif 1182-1182 | Offshore ship register is a subclass of ship register |
| (subclass FlagOfConvenienceRegister ShipRegister) | Transportation.kif 1198-1198 | Flag of convenience register is a subclass of ship register |
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