# Relationship history for MSHA mine 4604945

Current hierarchy: **Stelco Inc → Kanawha Coal Company → Madison Mine No 1-A**

- 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:** Stelco Inc → Madison Mine No 1-A; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kanawha Coal Company → Madison Mine No 1-A; 1975-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stelco Inc → Kanawha Coal Company; 1975-11-01 to current/open; source msha-controller-operator-history