| Relationships | Role | Relationship Start | Relationship End |
| Heidelberger Zement Aktiengesellschaft | Parent | 12/31/1980 | 1/1/1991 |
| National Cement Co, Inc. | Subsidary | 12/31/1980 | 1/1/1991 |
| Relationships | Role | Relationship Start | Relationship End |
| Heidelberger Zement Aktiengesellschaft | Parent | 12/31/1980 | 1/1/1991 |
| National Cement Co, Inc. | Subsidary | 12/31/1980 | 1/1/1991 |