# Relationship history for MSHA mine 4404853

Current hierarchy: **Billy Ray  Dotson → Rookie Coal Company 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Dotson Rail & Dexter → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & D Coal Company → No 1; 1977-09-01 to 1983-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Dotson Rail & Dexter → R & D Coal Company; 1977-09-01 to 1983-03-21; source msha-controller-operator-history
- **operator_operates_mine:** Rookie Coal Company Inc → No 1; 1983-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Billy Ray  Dotson → No 1; 1983-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billy Ray  Dotson → Rookie Coal Company Inc; 1983-03-22 to current/open; source msha-controller-operator-history