| Relationships | Role | Relationship Start | Relationship End |
| Ihc Caland N.V. | Parent | 12/31/1987 | 12/30/1990 |
| Ihc Caland N.V. | Parent | 12/31/1984 | 12/30/1987 |
| Fugro Inter Inc. | Subsidary | 12/31/1982 | 12/30/1987 |
| Relationships | Role | Relationship Start | Relationship End |
| Ihc Caland N.V. | Parent | 12/31/1987 | 12/30/1990 |
| Ihc Caland N.V. | Parent | 12/31/1984 | 12/30/1987 |
| Fugro Inter Inc. | Subsidary | 12/31/1982 | 12/30/1987 |