# Relationship history for MSHA mine 4104648

Current hierarchy: **Oscar A  Palacios → Tres Palacios Dirt, Sand & Gravel → La Calichera 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Tres Palacios Dirt, Sand & Gravel → La Calichera Pit; 2007-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oscar A  Palacios → La Calichera Pit; 2007-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oscar A  Palacios → Tres Palacios Dirt, Sand & Gravel; 2007-02-23 to current/open; source msha-controller-operator-history