# Relationship history for MSHA mine 1517999

Current hierarchy: **Phoenix Coal Corporation → Renfro Equipment Inc → Renfro Equipment Inc**

- 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

- **operator_operates_mine:** Renfro Equipment Inc → Renfro Equipment Inc; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stuart  Renfro → Renfro Equipment Inc; 1997-10-01 to 2008-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Stuart  Renfro → Renfro Equipment Inc; 1997-10-01 to 2008-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Phoenix Coal Corporation → Renfro Equipment Inc; 2008-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phoenix Coal Corporation → Renfro Equipment Inc; 2008-10-26 to current/open; source msha-controller-operator-history