# Relationship history for MSHA mine 0301523

Current hierarchy: **Horne Manuel & Thomas D Gilbert → H & H Coal Company Inc → Bates No 1**

- 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

- **controller_controls_mine:** Horne Manuel & Thomas D Gilbert → Bates No 1; 1980-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & H Coal Company Inc → Bates No 1; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horne Manuel & Thomas D Gilbert → H & H Coal Company Inc; 1982-03-01 to current/open; source msha-controller-operator-history