# Relationship history for MSHA mine 3606878

Current hierarchy: **Woll John W → Star Coal Company → No 1 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:** Star Coal Company → No 1 Slope; 1979-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Woll John W Et Al → No 1 Slope; 1979-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Woll John W Et Al → Star Coal Company; 1979-09-01 to current/open; source msha-controller-operator-history