# Relationship history for MSHA mine 1514286

Current hierarchy: **Buchanan Willard-Hubert → Buchanan Coal Company → 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

- **operator_operates_mine:** R & W Coal Company → No 1; 1983-10-01 to 1986-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Willard B & Randy → No 1; 1983-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Willard B & Randy → R & W Coal Company; 1983-10-01 to 1986-10-30; source msha-controller-operator-history
- **operator_operates_mine:** L & W Coal Company → No 1; 1986-10-31 to 1987-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Lawson Ray B-Tony Wilson Et Al → No 1; 1986-10-31 to 1987-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Lawson Ray B-Tony Wilson Et Al → L & W Coal Company; 1986-10-31 to 1987-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Buchanan Coal Company → No 1; 1987-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Buchanan Willard-Hubert Et Al → No 1; 1987-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buchanan Willard-Hubert Et Al → Buchanan Coal Company; 1987-03-31 to current/open; source msha-controller-operator-history