# Relationship history for MSHA mine 1516270

Current hierarchy: **American Electric Power Company Inc → AEP Kentucky Coal, L. L. C. → Elkhorn Loading Facility**

- 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:** Donn A  Chickering → Elkhorn Loading Facility; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dunleary Coal Corp → Elkhorn Loading Facility; 1987-12-01 to 1990-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Derek  Potter et al → Elkhorn Loading Facility; 1987-12-01 to 1990-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Derek  Potter et al → Dunleary Coal Corp; 1987-12-01 to 1990-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Sunnyside Kentucky Inc → Elkhorn Loading Facility; 1990-05-01 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Sunnyside Mines Inc → Elkhorn Loading Facility; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunnyside Mines Inc → Sunnyside Kentucky Inc; 1990-05-01 to 1992-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Branham & Baker Coal Company Inc → Elkhorn Loading Facility; 1992-04-01 to 2001-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Donn A  Chickering → Branham & Baker Coal Company Inc; 1992-04-01 to 2001-10-29; source msha-controller-operator-history
- **operator_operates_mine:** AEP Kentucky Coal, L. L. C. → Elkhorn Loading Facility; 2001-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** American Electric Power Company Inc → Elkhorn Loading Facility; 2001-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Electric Power Company Inc → AEP Kentucky Coal, L. L. C.; 2001-10-30 to current/open; source msha-controller-operator-history