# Relationship history for MSHA mine 1516850

Current hierarchy: **Tony R  Boyd → Miracle Coal 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:** Linley Todd  Tackett → No 1; 1988-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Raging Bull Coal Company Inc → No 1; 1990-04-01 to 2001-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Linley Todd  Tackett → Raging Bull Coal Company Inc; 1990-04-01 to 2001-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Miracle Coal Inc → No 1; 2001-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tony R  Boyd → No 1; 2001-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony R  Boyd → Miracle Coal Inc; 2001-02-26 to current/open; source msha-controller-operator-history