# Relationship history for MSHA mine 4603228

Current hierarchy: **Hylton Tracy W → Whitesville A & S Coal Company Inc → Slab Fork Tipple No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hylton Tracy W → Slab Fork Tipple No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Slab Fork Coal Company → Slab Fork Tipple No 2; 1950-01-01 to 1983-09-18; source msha-controller-operator-history
- **controller_controls_mine:** S Austin  Caperton III → Slab Fork Tipple No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S Austin  Caperton III → Slab Fork Coal Company; 1950-01-01 to 1983-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Whitesville A & S Coal Company Inc → Slab Fork Tipple No 2; 1983-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hylton Tracy W → Whitesville A & S Coal Company Inc; 1983-09-19 to current/open; source msha-controller-operator-history