# Relationship history for MSHA mine 4605792

Current hierarchy: **Consolidated Energy Systems Of Maryland Inc → Maidsville Coal Mining Partnership → Windy Hill #1 Ug**

- 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:** Consolidated Energy Systems Of Maryland Inc → Windy Hill #1 Ug; 1978-03-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maidsville Coal Mining Partnership → Windy Hill #1 Ug; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Energy Systems Of Maryland Inc → Maidsville Coal Mining Partnership; 1978-05-01 to current/open; source msha-controller-operator-history