# Relationship history for MSHA mine 3608427

Current hierarchy: **Studlack Timothy D → Oak Coal Company → S & S 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Oak Coal Company → S & S Slope; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Studlack Timothy D → S & S Slope; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Studlack Timothy D → Oak Coal Company; 1993-08-01 to current/open; source msha-controller-operator-history