# Relationship history for MSHA mine 1518942

Current hierarchy: **Clearwater Natural Resources LP → Miller Bros. Coal, LLC → Poor Branch Surface #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

- **controller_controls_mine:** Clearwater Natural Resources LP → Poor Branch Surface #1; 2005-08-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miller Bros. Coal, LLC → Poor Branch Surface #1; 2005-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clearwater Natural Resources LP → Miller Bros. Coal, LLC; 2005-11-15 to current/open; source msha-controller-operator-history