# Relationship history for MSHA mine 1517406

Current hierarchy: **Elmore Stoney D & Dick L Jackson → Kentucky Southern Coal Corp → Nortonville No 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

- **controller_controls_mine:** Elmore Stoney D & Dick L Jackson → Nortonville No 4; 1992-02-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smith Brothers Mining → Nortonville No 4; 1993-05-01 to 1994-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Smith Daniel F → Nortonville No 4; 1993-05-01 to 1994-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Smith Daniel F → Smith Brothers Mining; 1993-05-01 to 1994-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Southern Coal Corp → Nortonville No 4; 1994-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elmore Stoney D & Dick L Jackson → Kentucky Southern Coal Corp; 1994-09-22 to current/open; source msha-controller-operator-history