# Relationship history for MSHA mine 4003434

Current hierarchy: **Margarito  Lujan → United Stone LLC → Weeks Quarry**

- 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:** United Stone LLC → Weeks Quarry; 2013-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Margarito  Lujan → Weeks Quarry; 2013-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margarito  Lujan → United Stone LLC; 2013-03-26 to current/open; source msha-controller-operator-history