# Relationship history for MSHA mine 1506812

Current hierarchy: **Richard  Hurley → Hi Energy Inc → 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:** Hi Energy Inc → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Hurley → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Hurley → Hi Energy Inc; 1950-01-01 to current/open; source msha-controller-operator-history