# Relationship history for MSHA mine 3607727

Current hierarchy: **Berwind Corporation → Berwind Coal Sales Company → Huskin Run Siding**

- 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:** Berwind Coal Sales Company → Huskin Run Siding; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Berwind Corporation → Huskin Run Siding; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berwind Corporation → Berwind Coal Sales Company; 1985-07-01 to current/open; source msha-controller-operator-history