| Relationships | Role | Relationship Start | Relationship End |
| Agiv Aktiengesellschaft | Parent | 12/31/1993 | 12/30/1996 |
| Agiv Aktiengesellschaft | Parent | 12/31/1989 | 12/30/1993 |
| Agiv Aktiengesellschaft | Parent | 12/31/1980 | 12/30/1989 |
| Dresdner Bank Aktiengesellschaft | Parent | 12/31/1980 | 2/7/1989 |
| Frontier-Kemper Constructors, Inc. | Subsidary | 6/29/1988 | 12/30/1996 |
| Flatiron Structures Company Llc | Subsidary | 11/1/1993 | 12/30/1996 |
| Wayss & Freytag Usa Inc. | Subsidary | 12/31/1993 | 12/30/1996 |