# Relationship history for MSHA mine 1511799

Current hierarchy: **Kellione Cletis-Howard Norman → Big Apple Coal Corp → No 1**

- 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:** Walker George F → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sovereign Coal Corp → No 1; 1979-03-01 to 1981-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Walker George F → Sovereign Coal Corp; 1979-03-01 to 1981-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Sovereign Coal Corp → No 1; 1981-07-15 to 1985-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Inspiration Resources Corporation → No 1; 1981-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Inspiration Resources Corporation → Sovereign Coal Corp; 1981-07-15 to 1985-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Big Apple Coal Corp → No 1; 1985-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kellione Cletis-Howard Norman Et Al → No 1; 1985-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kellione Cletis-Howard Norman Et Al → Big Apple Coal Corp; 1985-03-18 to current/open; source msha-controller-operator-history