# Relationship history for MSHA mine 3401761

Current hierarchy: **CRH PLC → ARKHOLA → Okay 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

- **controller_controls_mine:** Ashland Inc → Okay Quarry; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Ben C  Lair → Okay Quarry; 1950-01-01 to 2000-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Ed  Mason → Okay Quarry; 1990-02-06 to 1994-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Southern Quikrete Products → Okay Quarry; 1991-06-01 to 1993-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Mason → Southern Quikrete Products; 1991-06-01 to 1993-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Vinita Rock Company → Okay Quarry; 1993-12-10 to 2000-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Ben C  Lair → Vinita Rock Company; 1993-12-10 to 2000-09-14; source msha-controller-operator-history
- **operator_operates_mine:** ARKHOLA → Okay Quarry; 2000-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → ARKHOLA; 2000-09-15 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Okay 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