# Relationship history for MSHA mine 1002394

Current hierarchy: **Rodney  Warfield; Larry Luke  Dammerman → Clearwater Rock and Crushing → Portable #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:** Clearwater Rock and Crushing → Portable #1; 2026-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry Luke  Dammerman et al → Portable #1; 2026-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry Luke  Dammerman et al → Clearwater Rock and Crushing; 2026-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney  Warfield → Clearwater Rock and Crushing; 2026-03-23 to current/open; source msha-controller-operator-history