# Relationship history for MSHA mine 3004177

Current hierarchy: **Nick  Britton; Kassidy J  Britton → Mad River Sand and Gravel → Mad River Sand and Gravel**

- 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:** Mad River Sand and Gravel → Mad River Sand and Gravel; 2026-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nick  Britton et al → Mad River Sand and Gravel; 2026-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick  Britton et al → Mad River Sand and Gravel; 2026-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kassidy J  Britton et al → Mad River Sand and Gravel; 2026-02-10 to current/open; source msha-controller-operator-history