# Relationship history for MSHA mine 0301563

Current hierarchy: **Hixson John & Raymond H → H & H Coal Company → Mine 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

- **operator_operates_mine:** H & H Coal Company → Mine No 1; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hixson John & Raymond H → Mine No 1; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hixson John & Raymond H → H & H Coal Company; 1984-01-01 to current/open; source msha-controller-operator-history