# Relationship history for MSHA mine 1511430

Current hierarchy: **Burchett Albert A → Eternity Coal Inc → No 1-U 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:** Eternity Coal Inc → No 1-U Mine; 1978-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burchett Albert A → No 1-U Mine; 1978-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burchett Albert A → Eternity Coal Inc; 1978-06-01 to current/open; source msha-controller-operator-history