# Relationship history for MSHA mine 1516909

Current hierarchy: **Roger  Hunter → Hunter Mining Inc → No 1**

- 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:** Williamson Terry → No 1; 1989-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Parsons Branch Coal Company Inc → No 1; 1990-07-01 to 1990-11-27; source msha-controller-operator-history
- **controller_controls_operator:** Williamson Terry → Parsons Branch Coal Company Inc; 1990-07-01 to 1990-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Hunter Mining Inc → No 1; 1990-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger  Hunter → No 1; 1990-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Hunter → Hunter Mining Inc; 1990-11-28 to current/open; source msha-controller-operator-history