# Relationship history for MSHA mine 4503669

Current hierarchy: **Wade  Matson → Action Materials → Wash 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:** Action Materials → Wash Plant #1; 2009-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wade  Matson → Wash Plant #1; 2009-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wade  Matson → Action Materials; 2009-08-14 to current/open; source msha-controller-operator-history