# Relationship history for MSHA mine 4104909

Current hierarchy: **Ledcor Group of Companies → Ledcor CMI Inc → LUX 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Ledcor CMI Inc → LUX QUARRY; 2011-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ledcor Group of Companies → LUX QUARRY; 2011-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ledcor Group of Companies → Ledcor CMI Inc; 2011-10-24 to current/open; source msha-controller-operator-history