# Relationship history for MSHA mine 4603727

Current hierarchy: **CRH PLC → Appalachian Aggregates, LLC → KELLY MOUNTAIN 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:** Black Rock Contracting Inc → KELLY MOUNTAIN QUARRY; 1950-01-01 to 1984-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Vecellio Group Inc → KELLY MOUNTAIN QUARRY; 1950-01-01 to 1984-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Vecellio Group Inc → Black Rock Contracting Inc; 1950-01-01 to 1984-04-09; source msha-controller-operator-history
- **operator_operates_mine:** R H Armstrong Inc → KELLY MOUNTAIN QUARRY; 1984-04-10 to 2002-10-03; source msha-controller-operator-history
- **controller_controls_mine:** R H Armstrong Inc → KELLY MOUNTAIN QUARRY; 1984-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R H Armstrong Inc → R H Armstrong Inc; 1984-04-10 to 2002-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Boxley Materials Co → KELLY MOUNTAIN QUARRY; 1991-03-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → KELLY MOUNTAIN QUARRY; 2000-04-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern West Virginia Asphalt Inc → KELLY MOUNTAIN QUARRY; 2002-10-04 to 2019-01-05; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Southern West Virginia Asphalt Inc; 2002-10-04 to 2019-01-05; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → KELLY MOUNTAIN QUARRY; 2016-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Aggregates, LLC → KELLY MOUNTAIN QUARRY; 2019-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boxley Materials Co → Appalachian Aggregates, LLC; 2019-01-06 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Appalachian Aggregates, LLC; 2019-01-06 to current/open; source msha-controller-operator-history