# Relationship history for MSHA mine 0301576

Current hierarchy: **CRH PLC → Arkhola Sand & Gravel Company → FORT SMITH SAND PLT**

- 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 → FORT SMITH SAND PLT; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** W D  Jeffrey → FORT SMITH SAND PLT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jeffrey Sand Company → FORT SMITH SAND PLT; 1984-06-01 to 1994-11-30; source msha-controller-operator-history
- **controller_controls_operator:** W D  Jeffrey → Jeffrey Sand Company; 1984-06-01 to 1994-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Arkhola Sand & Gravel Company → FORT SMITH SAND PLT; 1994-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Arkhola Sand & Gravel Company; 1994-12-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → FORT SMITH SAND PLT; 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