# Relationship history for MSHA mine 4105041

Current hierarchy: **Lorena  Lujan; Manuel  Lujan Sr → Lujan Farms Barstow Sand & Gravel → Barstow Sand and Gravel 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Lujan Farms Barstow Sand & Gravel → Barstow Sand and Gravel Pit; 2013-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lorena  Lujan → Barstow Sand and Gravel Pit; 2013-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lorena  Lujan → Lujan Farms Barstow Sand & Gravel; 2013-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manuel  Lujan Sr → Lujan Farms Barstow Sand & Gravel; 2013-11-04 to current/open; source msha-controller-operator-history