# Relationship history for MSHA mine 0202832

Current hierarchy: **Douglas  Smith → Churchman Sand and Gravel LLC → RIVER ROAD 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

- **operator_operates_mine:** Churchman Sand & Gravel → RIVER ROAD PLANT; 1999-08-01 to 2021-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Richard Leon  Smith → RIVER ROAD PLANT; 1999-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard Leon  Smith → Churchman Sand & Gravel; 1999-08-01 to 2021-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Churchman Sand and Gravel LLC → RIVER ROAD PLANT; 2021-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Smith → RIVER ROAD PLANT; 2021-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Smith → Churchman Sand and Gravel LLC; 2021-03-11 to current/open; source msha-controller-operator-history