# Relationship history for MSHA mine 4001678

Current hierarchy: **Hibben Paul G → Flatwood 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Flatwood Coal Company Inc → No 1 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hibben Paul G → No 1 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hibben Paul G → Flatwood Coal Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history