# Relationship history for MSHA mine 4605230

Current hierarchy: **Mc Kee Ralph → Wyoming Mining Company Inc → No 71 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

- **controller_controls_mine:** Mc Kee Ralph → No 71 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wyoming Mining Company Inc → No 71 Mine; 1976-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kee Ralph → Wyoming Mining Company Inc; 1976-07-14 to current/open; source msha-controller-operator-history