# Relationship history for MSHA mine 1514100

Current hierarchy: **Clyde  Boyd → Toler Creek Energy 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Adkins Willard → No 1; 1983-04-14 to 1985-09-08; source msha-controller-operator-history
- **operator_operates_mine:** J W Coal Company → No 1; 1983-06-01 to 1985-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Willard → J W Coal Company; 1983-06-01 to 1985-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Northern Cross Coal Enterprises Inc → No 1; 1985-03-19 to 1986-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Burl → No 1; 1985-03-19 to 1986-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Burl → Northern Cross Coal Enterprises Inc; 1985-03-19 to 1986-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Toler Creek Energy Inc → No 1; 1986-09-24 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
- **controller_controls_operator:** Clyde  Boyd → Toler Creek Energy Inc; 1986-09-24 to current/open; source msha-controller-operator-history