# Relationship history for MSHA mine 4104963

Current hierarchy: **CRH PLC → Texas Materials Group, Inc → Texas Materials Garfield 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Ashland Inc → Texas Materials Garfield Plant; 1999-07-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Texas Materials Garfield Plant; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC Texas Inc → Texas Materials Garfield Plant; 2012-10-10 to 2017-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC Texas Inc; 2012-10-10 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC Texas Inc; 2012-10-10 to 2017-03-13; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Texas Materials Garfield Plant; 2014-05-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle Materials Texas → Texas Materials Garfield Plant; 2017-03-14 to 2018-11-07; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Materials Texas; 2017-03-14 to 2018-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Texas Materials Group, Inc → Texas Materials Garfield Plant; 2018-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Texas Materials Group, Inc; 2018-11-08 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Texas Materials Group, Inc; 2018-11-08 to current/open; source msha-controller-operator-history