# Relationship history for MSHA mine 1518923

Current hierarchy: **Franky O  Wallace → Wallace Coal Augering → Burton Bend**

- 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:** Quinco → Burton Bend; 2005-09-15 to 2007-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Quentin O  Meade → Burton Bend; 2005-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quentin O  Meade → Quinco; 2005-09-15 to 2007-08-12; source msha-controller-operator-history
- **operator_operates_mine:** Wallace Coal Augering → Burton Bend; 2007-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Franky O  Wallace → Burton Bend; 2007-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Franky O  Wallace → Wallace Coal Augering; 2007-08-13 to current/open; source msha-controller-operator-history