# Relationship history for MSHA mine 1510508

Current hierarchy: **Beverly Ben → Red Hawk Coal Corp → No 1 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:** Kentucky Heritage Coal Inc → No 1 Mine; 1977-06-01 to 1981-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Smith Daniel F → No 1 Mine; 1977-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Daniel F → Kentucky Heritage Coal Inc; 1977-06-01 to 1981-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Red Hawk Coal Corp → No 1 Mine; 1981-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Beverly Ben → No 1 Mine; 1981-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beverly Ben → Red Hawk Coal Corp; 1981-06-24 to current/open; source msha-controller-operator-history