# Relationship history for MSHA mine 3800578

Current hierarchy: **Bowen Ernest L → Lexington Sand Company → Bowen Pit**

- 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:** Wise Sand Company → Bowen Pit; 1980-11-01 to 1981-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Wise C C → Bowen Pit; 1980-11-01 to 1981-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Wise C C → Wise Sand Company; 1980-11-01 to 1981-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Sand Company → Bowen Pit; 1981-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bowen Ernest L → Bowen Pit; 1981-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowen Ernest L → Lexington Sand Company; 1981-08-04 to current/open; source msha-controller-operator-history