# Relationship history for MSHA mine 1512761

Current hierarchy: **Coleman Clifford & Ermal B → Oak Ridge Coal Company Inc → No 2**

- 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:** Nick A  Cooley et al → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Clifford & Ermal B Et Al → No 2; 1976-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Curry Roy → No 2; 1979-12-01 to 1985-05-02; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Elkhorn Coals Inc → No 2; 1981-03-01 to 1982-02-18; source msha-controller-operator-history
- **controller_controls_operator:** Nick A  Cooley et al → Kentucky Elkhorn Coals Inc; 1981-03-01 to 1982-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Curry Mining Corp → No 2; 1982-02-19 to 1985-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Curry Roy → Curry Mining Corp; 1982-02-19 to 1985-05-02; source msha-controller-operator-history
- **controller_controls_mine:** Johns Barry Et Al → No 2; 1984-06-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wilgar Land Company → No 2; 1985-05-03 to 1986-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Johns Barry Et Al → Wilgar Land Company; 1985-05-03 to 1986-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Oak Ridge Coal Company Inc → No 2; 1986-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Clifford & Ermal B Et Al → Oak Ridge Coal Company Inc; 1986-05-12 to current/open; source msha-controller-operator-history