# Relationship history for MSHA mine 1514706

Current hierarchy: **Tommy G  Gambrel → Brushy Mountain Coal Company Inc → Mackey #4**

- 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

- **operator_operates_mine:** Brushy Mountain Coal Company Inc → Mackey #4; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tommy G  Gambrel et al → Mackey #4; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tommy G  Gambrel et al → Brushy Mountain Coal Company Inc; 1984-06-01 to current/open; source msha-controller-operator-history