# Relationship history for MSHA mine 1512034

Current hierarchy: **Hurley Willie & Wilson Combs Jr → Combs & Hurley Coal Company Inc → No 3 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hurley Willie & Wilson Combs Jr → No 3 Mine; 1978-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Combs & Hurley Coal Company Inc → No 3 Mine; 1979-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hurley Willie & Wilson Combs Jr → Combs & Hurley Coal Company Inc; 1979-09-01 to current/open; source msha-controller-operator-history