# Relationship history for MSHA mine 4602397

Current hierarchy: **Tolbert Joe → Tolbert Coal Company → No 1 Pile**

- 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:** Slab Fork Coal Company → No 1 Pile; 1950-01-01 to 1984-09-13; source msha-controller-operator-history
- **controller_controls_mine:** S Austin  Caperton III → No 1 Pile; 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 1984-09-13; source msha-controller-operator-history
- **operator_operates_mine:** D & H Trucking → No 1 Pile; 1984-09-14 to 1985-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Harrah Delmer → No 1 Pile; 1984-09-14 to 1985-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Harrah Delmer → D & H Trucking; 1984-09-14 to 1985-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Tolbert Coal Company → No 1 Pile; 1985-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tolbert Joe → No 1 Pile; 1985-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tolbert Joe → Tolbert Coal Company; 1985-07-31 to current/open; source msha-controller-operator-history