# Relationship history for MSHA mine 0300039

Current hierarchy: **CRH PLC → APAC-Central Inc. → WEST FORK QUARRY & 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

- **operator_operates_mine:** APAC-Central Inc. → WEST FORK QUARRY & PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → WEST FORK QUARRY & PLANT; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC-Central Inc.; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → WEST FORK QUARRY & PLANT; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC-Central Inc.; 2006-08-28 to current/open; source msha-controller-operator-history