# Relationship history for MSHA mine 4103169

Current hierarchy: **Hanson PLC → Gifford-Hill & Company → Stooksberry 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Hanson PLC → Stooksberry Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** D P  Frost → Stooksberry Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rutherford Bobby & Baker Marine → Stooksberry Pit; 1980-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bobby Rutherford Inc → Stooksberry Pit; 1983-05-01 to 1984-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Rutherford Bobby & Baker Marine → Bobby Rutherford Inc; 1983-05-01 to 1984-05-08; source msha-controller-operator-history
- **operator_operates_mine:** D P Frost Construction Company Inc → Stooksberry Pit; 1984-05-09 to 1986-10-23; source msha-controller-operator-history
- **controller_controls_operator:** D P  Frost → D P Frost Construction Company Inc; 1984-05-09 to 1986-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Gifford-Hill & Company → Stooksberry Pit; 1986-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Gifford-Hill & Company; 1986-10-24 to current/open; source msha-controller-operator-history