| Relationships | Role | Relationship Start | Relationship End |
| Preussag Aktiengesellschaft | Parent | 12/31/1980 | 12/30/1984 |
| International Oil And Gas Corp. | Subsidary | 10/20/1981 | 12/30/1984 |
| Relationships | Role | Relationship Start | Relationship End |
| Preussag Aktiengesellschaft | Parent | 12/31/1980 | 12/30/1984 |
| International Oil And Gas Corp. | Subsidary | 10/20/1981 | 12/30/1984 |