# Relationship history for MSHA mine 3606112

Current hierarchy: **Wilkins George → G F J Coal Company → No 4 Vein Slope**

- 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:** G F J Coal Company → No 4 Vein Slope; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilkins George → No 4 Vein Slope; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilkins George → G F J Coal Company; 1976-06-01 to current/open; source msha-controller-operator-history