# Relationship history for MSHA mine 4602794

Current hierarchy: **CRH PLC → Appalachian Aggregates, LLC → LEWISBURG 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:** Johnson Limestone Company → LEWISBURG PLANT; 1950-01-01 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Lee H  Johnson → LEWISBURG PLANT; 1950-01-01 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Lee H  Johnson → Johnson Limestone Company; 1950-01-01 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Aggregates, LLC → LEWISBURG PLANT; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boxley Materials Co → LEWISBURG PLANT; 1991-03-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Boxley Materials Co → Appalachian Aggregates, LLC; 1991-03-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → LEWISBURG PLANT; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Appalachian Aggregates, LLC; 2016-01-01 to current/open; source msha-controller-operator-history