# Relationship history for MSHA mine 1517172

Current hierarchy: **James River Coal Company → Bledsoe Coal Corp → No 66**

- 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:** Williams Companies Inc → No 66; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leeco Inc → No 66; 1991-12-01 to 1995-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Williams Companies Inc → Leeco Inc; 1991-12-01 to 1995-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Bledsoe Coal Corp → No 66; 1995-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → No 66; 1995-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Bledsoe Coal Corp; 1995-06-20 to current/open; source msha-controller-operator-history