# Relationship history for MSHA mine 4105294

Current hierarchy: **CRH PLC → Texas Materials Group Inc → Texas Materials San Saba 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:** Ashland Inc → Texas Materials San Saba Quarry; 1999-07-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Texas Materials San Saba Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** San Saba Aggregates, LLC → Texas Materials San Saba Quarry; 2017-08-30 to 2025-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Smith et al → Texas Materials San Saba Quarry; 2017-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Smith et al → San Saba Aggregates, LLC; 2017-08-30 to 2025-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Gene  Smith et al → San Saba Aggregates, LLC; 2017-08-30 to 2025-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Texas Materials Group Inc → Texas Materials San Saba Quarry; 2025-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Texas Materials Group Inc; 2025-04-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Texas Materials Group Inc; 2025-04-01 to current/open; source msha-controller-operator-history