# Relationship history for MSHA mine 4105252

Current hierarchy: **CRH PLC → Texas Materials Group, Inc → Halo Pit**

- 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 → Halo Pit; 1999-07-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Halo Pit; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Angel Brothers Holdings Corp → Halo Pit; 2017-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Century Asphalt, LTD. → Halo Pit; 2017-05-19 to 2021-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Angel Brothers Holdings Corp → Century Asphalt, LTD.; 2017-05-19 to 2021-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Texas Materials Group, Inc → Halo Pit; 2021-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Texas Materials Group, Inc; 2021-07-31 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Texas Materials Group, Inc; 2021-07-31 to current/open; source msha-controller-operator-history