# Relationship history for MSHA mine 2301911

Current hierarchy: **CRH PLC → Apac-Missouri Inc → PRESTAGE QY & MAT INC**

- 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:** Prestage Quarry Of Laurie Inc → PRESTAGE QY & MAT INC; 1985-04-01 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Max  Prestage → PRESTAGE QY & MAT INC; 1985-04-01 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Max  Prestage → Prestage Quarry Of Laurie Inc; 1985-04-01 to 1993-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Prestage Quarry & Materials Inc → PRESTAGE QY & MAT INC; 1993-07-01 to 1998-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Clarkson Construction Co et al → PRESTAGE QY & MAT INC; 1993-07-01 to 1998-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Clarkson Construction Co et al → Prestage Quarry & Materials Inc; 1993-07-01 to 1998-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → PRESTAGE QY & MAT INC; 1998-02-03 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Apac-Missouri Inc → PRESTAGE QY & MAT INC; 1998-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac-Missouri Inc; 1998-11-30 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → PRESTAGE QY & MAT INC; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Apac-Missouri Inc; 2006-08-28 to current/open; source msha-controller-operator-history