# Relationship history for MSHA mine 1510862

Current hierarchy: **Excello Coal Corp → Excello Coal Corp Of Ky → No 1 Surface**

- 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

- **controller_controls_mine:** Excello Coal Corp → No 1 Surface; 1976-11-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Excello Coal Corp Of Ky → No 1 Surface; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Excello Coal Corp → Excello Coal Corp Of Ky; 1977-11-01 to current/open; source msha-controller-operator-history