# Relationship history for MSHA mine 4601515

Current hierarchy: **S Austin  Caperton III → Slab Fork Coal Company → Winding Gulf #4**

- 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:** Westmoreland Coal Company → Winding Gulf #4; 1950-01-01 to 1982-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Winding Gulf #4; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1950-01-01 to 1982-04-21; source msha-controller-operator-history
- **controller_controls_mine:** S Austin  Caperton III → Winding Gulf #4; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Slab Fork Coal Company → Winding Gulf #4; 1982-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S Austin  Caperton III → Slab Fork Coal Company; 1982-04-22 to current/open; source msha-controller-operator-history