# Relationship history for MSHA mine 4604452

Current hierarchy: **Hatcher John D → Superior Pocahontas Coal Company → Micco Prep Plant**

- 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:** Hatcher John D → Micco Prep Plant; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Superior Pocahontas Coal Company → Micco Prep Plant; 1974-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hatcher John D → Superior Pocahontas Coal Company; 1974-10-24 to current/open; source msha-controller-operator-history