# Relationship history for MSHA mine 1515264

Current hierarchy: **Harrington James → Kentucky Southern Coal Corp → Nortonville South #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Howard Laurence B Jr → Nortonville South #4; 1984-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Norton Coal Corp → Nortonville South #4; 1985-07-01 to 1987-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Howard Laurence B Jr → Norton Coal Corp; 1985-07-01 to 1987-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Cam-Hawk Coal Company Inc → Nortonville South #4; 1987-11-03 to 1989-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Hawkins Lawrence E → Nortonville South #4; 1987-11-03 to 1989-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Hawkins Lawrence E → Cam-Hawk Coal Company Inc; 1987-11-03 to 1989-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Norton Coal Corp → Nortonville South #4; 1989-02-02 to 1990-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Richey C W → Nortonville South #4; 1989-02-02 to 1990-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Richey C W → Norton Coal Corp; 1989-02-02 to 1990-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Partners Coal Company Inc → Nortonville South #4; 1990-09-17 to 1992-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Gamblin Dale → Nortonville South #4; 1990-09-17 to 1992-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Gamblin Dale → Partners Coal Company Inc; 1990-09-17 to 1992-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Southern Coal Corp → Nortonville South #4; 1992-02-03 to 1998-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Elmore Stoney D & Dick L Jackson → Nortonville South #4; 1992-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elmore Stoney D & Dick L Jackson → Kentucky Southern Coal Corp; 1992-02-03 to 1998-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Southern Coal Corp → Nortonville South #4; 1998-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harrington James → Nortonville South #4; 1998-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harrington James → Kentucky Southern Coal Corp; 1998-02-10 to current/open; source msha-controller-operator-history