# Relationship history for MSHA mine 4002541

Current hierarchy: **Lueking Donovan F → Elgin Coal Sales → Elgin Coal Sales**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Elgin Coal Sales → Elgin Coal Sales; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lueking Donovan F → Elgin Coal Sales; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lueking Donovan F → Elgin Coal Sales; 1979-07-01 to current/open; source msha-controller-operator-history