# Relationship history for MSHA mine 1513451

Current hierarchy: **Farley Herbert → Expansion Coal Company → No 1 Mine (D9**

- 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:** Expansion Coal Company → No 1 Mine (D9; 1982-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Farley Herbert → No 1 Mine (D9; 1982-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Farley Herbert → Expansion Coal Company; 1982-04-01 to current/open; source msha-controller-operator-history