# Relationship history for MSHA mine 1517271

Current hierarchy: **Edward  Horn → Horn Construction Company Inc → Horn 3a**

- 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:** United  Company → Horn 3a; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward  Horn → Horn 3a; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Looney Roy Et Al → Horn 3a; 1984-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John M  Potter et al → Horn 3a; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Looney Brothers Coal Company Inc → Horn 3a; 1992-07-01 to 1992-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Looney Roy Et Al → Looney Brothers Coal Company Inc; 1992-07-01 to 1992-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → Horn 3a; 1992-10-06 to 1993-01-18; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1992-10-06 to 1993-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Sunny Ridge Mining Company Inc → Horn 3a; 1993-01-19 to 1996-01-29; source msha-controller-operator-history
- **controller_controls_operator:** John M  Potter et al → Sunny Ridge Mining Company Inc; 1993-01-19 to 1996-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Potter et al → Sunny Ridge Mining Company Inc; 1993-01-19 to 1996-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Horn Construction Company Inc → Horn 3a; 1996-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Horn → Horn Construction Company Inc; 1996-01-30 to current/open; source msha-controller-operator-history