| Relationships | Role | Relationship Start | Relationship End |
| Lexco Petroleum, Inc. | Parent | 11/7/1986 | 10/16/1992 |
| First Enid, Inc. | Parent | 9/1/1982 | 11/6/1986 |
| Relationships | Role | Relationship Start | Relationship End |
| Lexco Petroleum, Inc. | Parent | 11/7/1986 | 10/16/1992 |
| First Enid, Inc. | Parent | 9/1/1982 | 11/6/1986 |