# Relationship history for MSHA mine 4605939

Current hierarchy: **Salyers Don → C L & S Coal Company Inc → #2**

- 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:** United Appalachian Coals Inc → #2; 1979-01-01 to 1984-02-22; source msha-controller-operator-history
- **controller_controls_mine:** Clevenger W G → #2; 1979-01-01 to 1984-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Clevenger W G → United Appalachian Coals Inc; 1979-01-01 to 1984-02-22; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Don → #2; 1981-06-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C L & S Coal Company Inc → #2; 1984-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Don → C L & S Coal Company Inc; 1984-02-23 to current/open; source msha-controller-operator-history