# Relationship history for MSHA mine 0202201

Current hierarchy: **Lewis Richard → Meadow Valley Contractors → Bullhead City Batch Plant & Pit**

- 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:** Meadow Valley Contractors → Bullhead City Batch Plant & Pit; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lewis Richard → Bullhead City Batch Plant & Pit; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lewis Richard → Meadow Valley Contractors; 1984-04-01 to current/open; source msha-controller-operator-history