# Relationship history for MSHA mine 2301420

Current hierarchy: **CRH PLC → Apac-Missouri, Inc. → D Y L 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

- **operator_operates_mine:** D Y L Quarries Inc → D Y L Quarry; 1950-01-01 to 1998-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Lambeth Eugene → D Y L Quarry; 1950-01-01 to 1998-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Lambeth Eugene → D Y L Quarries Inc; 1950-01-01 to 1998-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → D Y L Quarry; 1998-02-03 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** D Y L Quarries Inc → D Y L Quarry; 1998-02-03 to 1998-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Clarkson Construction Co et al → D Y L Quarry; 1998-02-03 to 1998-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Clarkson Construction Co et al → D Y L Quarries Inc; 1998-02-03 to 1998-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Apac-Missouri, Inc. → D Y L Quarry; 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 → D Y L Quarry; 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