# Relationship history for MSHA mine 5001478

Current hierarchy: **George R  Horner → H & H Contractors Inc → North Pole Pit**

- 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:** George R  Horner → North Pole Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & H Contractors Inc → North Pole Pit; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George R  Horner → H & H Contractors Inc; 1984-08-01 to current/open; source msha-controller-operator-history