# Relationship history for MSHA mine 3401940

Current hierarchy: **CRH PLC → ARKHOLA → Spiro 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Ashland Inc → Spiro Quarry; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** ARKHOLA → Spiro Quarry; 2004-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → ARKHOLA; 2004-07-20 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Spiro Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → ARKHOLA; 2006-08-28 to current/open; source msha-controller-operator-history