# Relationship history for MSHA mine 4202354

Current hierarchy: **CRH PLC → Staker & Parson Companies → Browns Canyon**

- 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 → Browns Canyon; 2002-05-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Z-Rock → Browns Canyon; 2003-02-05 to 2008-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Steve R  Zabriskie → Browns Canyon; 2003-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve R  Zabriskie → Z-Rock; 2003-02-05 to 2008-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Steve R  Zabriskie → Browns Canyon; 2003-06-28 to 2008-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Martin T  White → Browns Canyon; 2008-04-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tru Crushing → Browns Canyon; 2008-04-15 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Martin T  White → Tru Crushing; 2008-04-15 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Steve R  Zabriskie → Tru Crushing; 2008-04-15 to 2008-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Staker & Parson Companies → Browns Canyon; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Staker & Parson Companies; 2011-01-01 to current/open; source msha-controller-operator-history