# Relationship history for MSHA mine 4104489

Current hierarchy: **CRH PLC → Texas Materials Group Inc → Marble Falls Quarry**

- 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:** Zachry Corporation → Marble Falls Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Marble Falls Quarry; 1999-07-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Capitol Aggregates, Inc. → Marble Falls Quarry; 2004-08-12 to 2014-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Zachry Corporation → Capitol Aggregates, Inc.; 2004-08-12 to 2014-05-26; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Marble Falls Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle Materials Texas → Marble Falls Quarry; 2014-05-27 to 2024-04-01; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Marble Falls Quarry; 2014-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Materials Texas; 2014-05-27 to 2024-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Texas Materials Group Inc → Marble Falls Quarry; 2024-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Texas Materials Group Inc; 2024-04-02 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Texas Materials Group Inc; 2024-04-02 to current/open; source msha-controller-operator-history