# Relationship history for MSHA mine 4202744

Current hierarchy: **Michael L Walker → Stein Crushing, L.L.C. → Stein Crushing #1**

- 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:** Stein Crushing, L.L.C. → Stein Crushing #1; 2022-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael L Walker → Stein Crushing #1; 2022-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael L Walker → Stein Crushing, L.L.C.; 2022-10-18 to current/open; source msha-controller-operator-history