| Relationships | Role | Relationship Start | Relationship End |
| Imerys | Parent | 12/31/1992 | 9/22/1999 |
| Copperweld Tubing Products Co. | Subsidary | 12/31/1992 | 9/22/1999 |
| Copperweld Bimetallic Products Co. | Subsidary | 12/31/1992 | 9/22/1999 |
| Copperweld International Co. | Subsidary | 12/31/1992 | 9/22/1999 |
| Miami Acquisition Corporation | Subsidary | 11/30/1993 | 9/22/1999 |
| Tac Acquisition Corporation | Subsidary | 4/30/1997 | 9/22/1999 |