# Relationship history for MSHA mine 4201806

Current hierarchy: **Shumway Gary → Western Key Enterprise → Wilson Group Mine**

- 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:** Western Key Enterprise → Wilson Group Mine; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shumway Gary → Wilson Group Mine; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shumway Gary → Western Key Enterprise; 1982-11-01 to current/open; source msha-controller-operator-history