# Relationship history for MSHA mine 4102820

Current hierarchy: **CRH PLC → Ash Grove Cement South Texas LLC → Hunter Cement 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:** Texas Industries Inc → Hunter Cement Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TXI (A/K/A Texas Industries Inc) → Hunter Cement Plant; 1979-01-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI (A/K/A Texas Industries Inc); 1979-01-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Hunter Cement Plant; 2004-12-01 to 2014-07-01; source msha-controller-operator-history
- **operator_operates_mine:** TXI Operations LP → Hunter Cement Plant; 2005-03-15 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI Operations LP; 2005-03-15 to 2014-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Hunter Cement Plant; 2014-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → TXI Operations LP; 2014-07-02 to 2022-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Ash Grove Cement South Texas LLC → Hunter Cement Plant; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Hunter Cement Plant; 2023-01-01 to 2024-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Ash Grove Cement South Texas LLC; 2023-01-01 to 2024-10-22; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Hunter Cement Plant; 2024-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Ash Grove Cement South Texas LLC; 2024-10-23 to current/open; source msha-controller-operator-history