# Relationship history for MSHA mine 4407168

Current hierarchy: **CRH PLC → Appalachian Aggregates, LLC → DICKENSONVILLE 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

- **controller_controls_mine:** Boxley Materials Co → DICKENSONVILLE PLANT; 1991-03-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → DICKENSONVILLE PLANT; 2005-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → DICKENSONVILLE PLANT; 2006-01-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rock It Stone Inc → DICKENSONVILLE PLANT; 2006-04-24 to 2007-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Bobby W  Hill et al → DICKENSONVILLE PLANT; 2006-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby W  Hill et al → Rock It Stone Inc; 2006-04-24 to 2007-01-10; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle Industrial Minerals, Inc. → DICKENSONVILLE PLANT; 2007-01-11 to 2008-12-28; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle Industrial Minerals, Inc.; 2007-01-11 to 2008-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Materials Inc → DICKENSONVILLE PLANT; 2008-12-29 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Mountain Materials Inc; 2008-12-29 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → DICKENSONVILLE PLANT; 2016-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Aggregates, LLC → DICKENSONVILLE PLANT; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boxley Materials Co → Appalachian Aggregates, LLC; 2021-01-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Appalachian Aggregates, LLC; 2021-01-01 to current/open; source msha-controller-operator-history