# Relationship history for MSHA mine 3400003

Current hierarchy: **CRH PLC → Arkhola Sand & Gravel Company → Arkhola No 1 Mine**

- 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

- **operator_operates_mine:** Arkhola Sand & Gravel Company → Arkhola No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Arkhola No 1 Mine; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Arkhola Sand & Gravel Company; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Arkhola No 1 Mine; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Arkhola Sand & Gravel Company; 2006-08-28 to current/open; source msha-controller-operator-history