# Relationship history for MSHA mine 1502117

Current hierarchy: **Donn A  Chickering → Jenkins Letcher Coal Corp → Republic Mine**

- 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

- **operator_operates_mine:** Tuscaloosa Energy Corp → Republic Mine; 1950-01-01 to 1985-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Republic Steel Corp → Republic Mine; 1950-01-01 to 1985-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Republic Steel Corp → Tuscaloosa Energy Corp; 1950-01-01 to 1985-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Tuscaloosa Energy Corp → Republic Mine; 1985-01-28 to 1990-06-14; source msha-controller-operator-history
- **controller_controls_mine:** LTV Corporation → Republic Mine; 1985-01-28 to 1990-06-14; source msha-controller-operator-history
- **controller_controls_operator:** LTV Corporation → Tuscaloosa Energy Corp; 1985-01-28 to 1990-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Jenkins Letcher Coal Corp → Republic Mine; 1990-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donn A  Chickering → Republic Mine; 1990-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donn A  Chickering → Jenkins Letcher Coal Corp; 1990-06-15 to current/open; source msha-controller-operator-history