# Relationship history for MSHA mine 0503946

Current hierarchy: **Marshall T  Mathias → Mathias Concrete Inc → O'Bannon Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Ward E  Mathias et al → O'Bannon Pit; 1950-01-01 to 2020-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Estate of Henry T. Southway Jr. → O'Bannon Pit; 1982-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southway Construction Company Inc → O'Bannon Pit; 1984-04-01 to 1987-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Henry T. Southway Jr. → Southway Construction Company Inc; 1984-04-01 to 1987-04-28; source msha-controller-operator-history
- **operator_operates_mine:** O'Bannon → O'Bannon Pit; 1987-04-29 to 1989-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Grace  O'Bannon → O'Bannon Pit; 1987-04-29 to 1989-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Grace  O'Bannon → O'Bannon; 1987-04-29 to 1989-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Mathias Concrete Inc → O'Bannon Pit; 1989-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ward E  Mathias et al → Mathias Concrete Inc; 1989-10-18 to 2020-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Thomas G  Mathias et al → Mathias Concrete Inc; 1989-10-18 to 2020-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Marshall T  Mathias → O'Bannon Pit; 2020-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marshall T  Mathias → Mathias Concrete Inc; 2020-04-15 to current/open; source msha-controller-operator-history