# Relationship history for MSHA mine 4000581

Current hierarchy: **Layne Norman D → B W & L Coal Company Inc → No 2**

- 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:** Nunley & Thompson Coal Company Inc → No 2; 1950-01-01 to 1984-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Nunley James Earl → No 2; 1950-01-01 to 1984-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Nunley James Earl → Nunley & Thompson Coal Company Inc; 1950-01-01 to 1984-02-07; source msha-controller-operator-history
- **operator_operates_mine:** B D & M Coal Mining Inc → No 2; 1984-02-08 to 1984-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Hubbard Bruce → No 2; 1984-02-08 to 1984-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Hubbard Bruce → B D & M Coal Mining Inc; 1984-02-08 to 1984-06-24; source msha-controller-operator-history
- **operator_operates_mine:** M H Coal Company Inc → No 2; 1984-06-25 to 1985-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Fletcher Marvin H Jr → No 2; 1984-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Marvin H Jr → M H Coal Company Inc; 1984-06-25 to 1985-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Young William E → No 2; 1985-10-10 to 1988-03-06; source msha-controller-operator-history
- **operator_operates_mine:** B & B Mining Company → No 2; 1985-11-13 to 1987-04-26; source msha-controller-operator-history
- **controller_controls_operator:** Young William E → B & B Mining Company; 1985-11-13 to 1987-04-26; source msha-controller-operator-history
- **operator_operates_mine:** M H Coal Company Inc → No 2; 1987-04-27 to 1988-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Marvin H Jr → M H Coal Company Inc; 1987-04-27 to 1988-01-24; source msha-controller-operator-history
- **operator_operates_mine:** B W & L Coal Company Inc → No 2; 1988-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Layne Norman D Et Al → No 2; 1988-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Layne Norman D Et Al → B W & L Coal Company Inc; 1988-01-25 to current/open; source msha-controller-operator-history