# Relationship history for MSHA mine 2402825

Current hierarchy: **Zachary  Stevens; Tyrell  Stevens → Stevens Custom Crushing & Gravel, LLC → Plant #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Stevens Custom Crushing & Gravel, LLC → Plant #1; 2025-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tyrell  Stevens et al → Plant #1; 2025-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tyrell  Stevens et al → Stevens Custom Crushing & Gravel, LLC; 2025-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zachary  Stevens et al → Stevens Custom Crushing & Gravel, LLC; 2025-10-13 to current/open; source msha-controller-operator-history