# Relationship history for MSHA mine 1511719

Current hierarchy: **Leroy  Lackey → Red Star Coal Company → Unit Train**

- 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:** Consumers Coal Company → Unit Train; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Prince Coal Corp → Unit Train; 1978-12-01 to 1986-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Consumers Coal Company → Kentucky Prince Coal Corp; 1978-12-01 to 1986-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Leroy  Lackey et al → Unit Train; 1984-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Petrofina Oil Company et al → Unit Train; 1986-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Prince Mining Company → Unit Train; 1986-12-11 to 1992-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Petrofina Oil Company et al → Kentucky Prince Mining Company; 1986-12-11 to 1992-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Amax Inc  et al → Kentucky Prince Mining Company; 1986-12-11 to 1992-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Red Star Coal Company → Unit Train; 1992-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leroy  Lackey et al → Red Star Coal Company; 1992-04-29 to current/open; source msha-controller-operator-history