# Relationship history for MSHA mine 4405606

Current hierarchy: **Pilkenton Earl & Kenneth Roberts → River Coal Company → No 1 Strip**

- 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:** River Coal Company → No 1 Strip; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pilkenton Earl & Kenneth Roberts → No 1 Strip; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pilkenton Earl & Kenneth Roberts → River Coal Company; 1981-03-01 to current/open; source msha-controller-operator-history