# Relationship history for MSHA mine 1517227

Current hierarchy: **Eurmel  Hunter → Simpson'S Branch Coal Company 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Boyd Chester → No 1; 1982-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clyde  Boyd → No 1; 1986-09-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Toler Creek Energy Inc → No 1; 1992-05-01 to 1993-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Clyde  Boyd → Toler Creek Energy Inc; 1992-05-01 to 1993-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Jerry D  Boyd → No 1; 1992-12-01 to 1994-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Boyd Coal Company Inc → No 1; 1993-07-02 to 1994-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Jerry D  Boyd → Boyd Coal Company Inc; 1993-07-02 to 1994-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Boyd Coal Company Inc → No 1; 1994-06-15 to 1994-09-22; source msha-controller-operator-history
- **controller_controls_operator:** Boyd Chester → Boyd Coal Company Inc; 1994-06-15 to 1994-09-22; source msha-controller-operator-history
- **operator_operates_mine:** E & B Coal Company Inc → No 1; 1994-09-23 to 1996-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Eurmel  Hunter → No 1; 1994-09-23 to 1996-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Eurmel  Hunter → E & B Coal Company Inc; 1994-09-23 to 1996-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Simpson'S Branch Coal Company Inc → No 1; 1996-08-29 to 1997-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Meade Danny → No 1; 1996-08-29 to 1997-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Meade Danny → Simpson'S Branch Coal Company Inc; 1996-08-29 to 1997-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Simpson'S Branch Coal Company Inc → No 1; 1997-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eurmel  Hunter → No 1; 1997-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eurmel  Hunter → Simpson'S Branch Coal Company Inc; 1997-04-21 to current/open; source msha-controller-operator-history