# Relationship history for MSHA mine 1514712

Current hierarchy: **Davis Jerry M → Thunder Coal Company → 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:** Widows Grove Coal Company Inc → No 2; 1984-06-01 to 1984-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Exum Raymond → No 2; 1984-06-01 to 1984-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Exum Raymond → Widows Grove Coal Company Inc; 1984-06-01 to 1984-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Mr C Coal Company Inc → No 2; 1984-07-23 to 1984-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Les  Mayhorn et al → No 2; 1984-07-23 to 1987-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Les  Mayhorn et al → Mr C Coal Company Inc; 1984-07-23 to 1984-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Soft Bottom Coal Company Inc → No 2; 1984-10-10 to 1987-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Charles Sammy → No 2; 1984-10-10 to 1987-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Charles Sammy → Soft Bottom Coal Company Inc; 1984-10-10 to 1987-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Cedar-Pike Mining Company → No 2; 1987-01-13 to 1987-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Smith Donald J → No 2; 1987-01-13 to 1987-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Smith Donald J → Cedar-Pike Mining Company; 1987-01-13 to 1987-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Cedar-Pike Mining Inc → No 2; 1987-06-17 to 1992-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Campbell Zan → No 2; 1987-06-17 to 1992-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Zan → Cedar-Pike Mining Inc; 1987-06-17 to 1992-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Dee-Gee Enterprises Inc → No 2; 1992-10-09 to 1994-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Barton Delmar → No 2; 1992-10-09 to 1994-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Barton Delmar → Dee-Gee Enterprises Inc; 1992-10-09 to 1994-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Thunder Coal Company → No 2; 1994-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis Jerry M Et Al → No 2; 1994-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Jerry M Et Al → Thunder Coal Company; 1994-04-21 to current/open; source msha-controller-operator-history