| Relationships | Role | Relationship Start | Relationship End |
| Imref S.A. De C.V. | Parent | 2/2/1991 | 12/23/1994 |
| Corporacion Mundial De Servicios, S.A. De C.V. | Parent | 2/1/1988 | 2/1/1991 |
| Relationships | Role | Relationship Start | Relationship End |
| Imref S.A. De C.V. | Parent | 2/2/1991 | 12/23/1994 |
| Corporacion Mundial De Servicios, S.A. De C.V. | Parent | 2/1/1988 | 2/1/1991 |