# Relationship history for MSHA mine 4202440

Current hierarchy: **CRH PLC → Staker & Parson Companies → Trenton 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

- **controller_controls_mine:** CRH PLC → Trenton Pit; 2002-05-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Staker & Parson Companies → Trenton Pit; 2006-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Staker & Parson Companies; 2006-05-10 to current/open; source msha-controller-operator-history