# Relationship history for MSHA mine 4000475

Current hierarchy: **Cole Wilburn J & William D Pruett → Dark Diamond Inc → Mine 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

- **operator_operates_mine:** C L Kline Coal Company → Mine No 1; 1950-01-01 to 1982-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Kline C L (Estate) → Mine No 1; 1950-01-01 to 1982-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Kline C L (Estate) → C L Kline Coal Company; 1950-01-01 to 1982-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Daugherty Leona Et Al → Mine No 1; 1980-05-27 to 1987-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Comstock Coal Company Inc → Mine No 1; 1982-01-04 to 1984-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Russell William → Mine No 1; 1982-01-04 to 1990-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Russell William → Comstock Coal Company Inc; 1982-01-04 to 1984-10-17; source msha-controller-operator-history
- **operator_operates_mine:** A & L Coal Company Inc → Mine No 1; 1984-10-18 to 1985-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Daugherty Leona Et Al → A & L Coal Company Inc; 1984-10-18 to 1985-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Dark Diamond Inc → Mine No 1; 1985-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cole Wilburn J & William D Pruett → Mine No 1; 1985-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cole Wilburn J & William D Pruett → Dark Diamond Inc; 1985-03-18 to current/open; source msha-controller-operator-history