# Relationship history for MSHA mine 0301908

Current hierarchy: **CRH PLC → APAC-Central Inc. → Mountain Home Materials 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 → Mountain Home Materials Quarry; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** North Central Arkansas Quarry Inc → Mountain Home Materials Quarry; 2005-04-08 to 2023-12-17; source msha-controller-operator-history
- **controller_controls_mine:** Steven M.  Dilbeck → Mountain Home Materials Quarry; 2005-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven M.  Dilbeck → North Central Arkansas Quarry Inc; 2005-04-08 to 2023-12-17; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Mountain Home Materials Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC-Central Inc. → Mountain Home Materials Quarry; 2023-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC-Central Inc.; 2023-12-18 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC-Central Inc.; 2023-12-18 to current/open; source msha-controller-operator-history