# Relationship history for MSHA mine 1511971

Current hierarchy: **Denton Leet E → Denton Coal Company → Genessee**

- 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:** Denton Leet E → Genessee; 1977-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Denton Coal Company → Genessee; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Denton Leet E → Denton Coal Company; 1979-06-01 to current/open; source msha-controller-operator-history