# Relationship history for MSHA mine 1507257

Current hierarchy: **Nicholas  Saylor → Saylor Brothers Enterprises Inc → #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:** Melvin  Taylor → #1; 1973-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thomas Coal Company → #1; 1974-11-01 to 1976-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Thomas → #1; 1974-11-01 to 1976-07-05; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Thomas → Thomas Coal Company; 1974-11-01 to 1976-07-05; source msha-controller-operator-history
- **operator_operates_mine:** W & N Coal Company → #1; 1976-07-06 to 1979-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Willard  Saylor et al → #1; 1976-07-06 to 1979-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Willard  Saylor et al → W & N Coal Company; 1976-07-06 to 1979-03-12; source msha-controller-operator-history
- **operator_operates_mine:** T & M Coal Corp → #1; 1979-03-13 to 1983-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Taylor → T & M Coal Corp; 1979-03-13 to 1983-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Wet Creek Coal Company Inc → #1; 1983-12-09 to 1986-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Keston  Sturgill → #1; 1983-12-09 to 1986-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Keston  Sturgill → Wet Creek Coal Company Inc; 1983-12-09 to 1986-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Brock → #1; 1985-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bronco Mining Inc → #1; 1986-08-06 to 1987-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Brock → Bronco Mining Inc; 1986-08-06 to 1987-05-18; source msha-controller-operator-history
- **operator_operates_mine:** O C Coal Inc → #1; 1987-05-19 to 1992-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Orville  Clem → #1; 1987-05-19 to 1992-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Orville  Clem → O C Coal Inc; 1987-05-19 to 1992-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Alred → #1; 1989-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sandra  Roberts et al → #1; 1991-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & R Coal Company Inc → #1; 1992-11-04 to 1994-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Alred → R & R Coal Company Inc; 1992-11-04 to 1994-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Wallins Creek Mining Inc → #1; 1994-01-10 to 1994-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Sandra  Roberts et al → Wallins Creek Mining Inc; 1994-01-10 to 1994-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Connie  Roberts et al → Wallins Creek Mining Inc; 1994-01-10 to 1994-03-21; source msha-controller-operator-history
- **operator_operates_mine:** Lonesome Pines Inc → #1; 1994-03-22 to 1994-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Lisa B  Parrott → #1; 1994-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lisa B  Parrott → Lonesome Pines Inc; 1994-03-22 to 1994-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas  Saylor et al → #1; 1994-06-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Saylor Brothers Enterprises Inc → #1; 1994-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas  Saylor et al → Saylor Brothers Enterprises Inc; 1994-09-06 to current/open; source msha-controller-operator-history