# Relationship history for MSHA mine 2103268

Current hierarchy: **CRH PLC → Hardrives Inc → WASH PLANT**

- 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

- **controller_controls_mine:** Steve  Hall → WASH PLANT; 1950-01-01 to 2017-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Hardrives Inc → WASH PLANT; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Hall → Hardrives Inc; 2000-08-01 to 2017-02-23; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → WASH PLANT; 2017-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hardrives Inc; 2017-02-24 to current/open; source msha-controller-operator-history