# Relationship history for MSHA mine 4602793

Current hierarchy: **CRH PLC → Appalachian Aggregates, LLC → MERCER STONE 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** C Mike  Hunter Jr et al → MERCER STONE PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mercer Crushed Stone → MERCER STONE PLANT; 1950-01-01 to 1984-09-09; source msha-controller-operator-history
- **controller_controls_mine:** V N  Green → MERCER STONE PLANT; 1950-01-01 to 1984-09-09; source msha-controller-operator-history
- **controller_controls_operator:** V N  Green → Mercer Crushed Stone; 1950-01-01 to 1984-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Pounding Mill Quarry Corp → MERCER STONE PLANT; 1984-09-10 to 2018-07-16; source msha-controller-operator-history
- **controller_controls_operator:** C Mike  Hunter Jr et al → Pounding Mill Quarry Corp; 1984-09-10 to 2018-07-16; source msha-controller-operator-history
- **controller_controls_operator:** William C Hunter et al → Pounding Mill Quarry Corp; 1984-09-10 to 2018-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Boxley Materials Co → MERCER STONE PLANT; 1991-03-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → MERCER STONE PLANT; 2016-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Aggregates, LLC → MERCER STONE PLANT; 2018-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boxley Materials Co → Appalachian Aggregates, LLC; 2018-07-17 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Appalachian Aggregates, LLC; 2018-07-17 to current/open; source msha-controller-operator-history