# Relationship history for MSHA mine 1601432

Current hierarchy: **Richard F  Dawson → Bluff Creek WAM → Bluff Creek WAM 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Bluff Creek WAM → Bluff Creek WAM Plant 1; 2006-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard F  Dawson → Bluff Creek WAM Plant 1; 2006-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard F  Dawson → Bluff Creek WAM; 2006-01-21 to current/open; source msha-controller-operator-history