# Relationship history for MSHA mine 2300699

Current hierarchy: **New Madrid County-Mo → New Madrid County-Mo → New Madrid County Highway Department**

- 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:** O C Stewart Inc → New Madrid County Highway Department; 1950-01-01 to 1981-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Stewart O C → New Madrid County Highway Department; 1950-01-01 to 1981-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Stewart O C → O C Stewart Inc; 1950-01-01 to 1981-02-02; source msha-controller-operator-history
- **operator_operates_mine:** New Madrid County-Mo → New Madrid County Highway Department; 1981-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** New Madrid County-Mo → New Madrid County Highway Department; 1981-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Madrid County-Mo → New Madrid County-Mo; 1981-02-03 to current/open; source msha-controller-operator-history