# Relationship history for MSHA mine 0300256

Current hierarchy: **CRH PLC → Ash Grove Cement Company → Foreman Quarry & 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Ash Grove Cement Company → Foreman Quarry & Plant; 1950-01-01 to 2018-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Arkansas Cement Corp → Foreman Quarry & Plant; 1950-01-01 to 1985-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Arkansas Louisiana Gas Company → Foreman Quarry & Plant; 1950-01-01 to 1985-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Arkansas Louisiana Gas Company → Arkansas Cement Corp; 1950-01-01 to 1985-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Ash Grove Cement Company → Foreman Quarry & Plant; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Ash Grove Cement Company; 1985-10-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Foreman Quarry & Plant; 2018-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Ash Grove Cement Company; 2018-06-21 to current/open; source msha-controller-operator-history