# Relationship history for MSHA mine 1514599

Current hierarchy: **Hall Forest D → H & N Coal Company Inc → No 1 Surface Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** H & N Coal Company Inc → No 1 Surface Mine; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Forest D Et Al → No 1 Surface Mine; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Forest D Et Al → H & N Coal Company Inc; 1984-05-01 to current/open; source msha-controller-operator-history