# Relationship history for MSHA mine 4801616

Current hierarchy: **Tyler  Miller; Tom  Miller → Earth Work Solutions (WY) → State 36**

- 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:** Earth Work Solutions (WY) → State 36; 2002-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tyler  Miller et al → State 36; 2002-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tyler  Miller et al → Earth Work Solutions (WY); 2002-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Miller et al → Earth Work Solutions (WY); 2002-02-27 to current/open; source msha-controller-operator-history