# Relationship history for MSHA mine 1510468

Current hierarchy: **St Clair Energy Inc & The Hanover Group Inc → St Clair-Hanover Coal Company → No 1 Surface**

- 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

- **operator_operates_mine:** St Clair-Hanover Coal Company → No 1 Surface; 1977-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** St Clair Energy Inc & The Hanover Group Inc → No 1 Surface; 1977-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** St Clair Energy Inc & The Hanover Group Inc → St Clair-Hanover Coal Company; 1977-06-01 to current/open; source msha-controller-operator-history