# Relationship history for MSHA mine 4002535

Current hierarchy: **Skiles Stephen C → Emory River Coal Company → No 1 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:** Republic Coal Company Inc → No 1 Mine; 1979-03-01 to 1980-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Parker James B → No 1 Mine; 1979-03-01 to 1980-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Parker James B → Republic Coal Company Inc; 1979-03-01 to 1980-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Emory River Coal Company → No 1 Mine; 1980-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Skiles Stephen C → No 1 Mine; 1980-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skiles Stephen C → Emory River Coal Company; 1980-11-19 to current/open; source msha-controller-operator-history