# Relationship history for MSHA mine 1514822

Current hierarchy: **Caudill Hubert W → First Class Coal Company Inc → No 3**

- 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:** Potter Gordon → No 3; 1979-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marathon Coal Corp → No 3; 1984-08-01 to 1985-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Potter Gordon → Marathon Coal Corp; 1984-08-01 to 1985-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Emerald Coal Corp → No 3; 1985-06-17 to 1986-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Stresher Bobby → No 3; 1985-06-17 to 1986-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Stresher Bobby → Emerald Coal Corp; 1985-06-17 to 1986-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Bituminous Coal Company Inc → No 3; 1986-03-04 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Bennett H Morton → No 3; 1986-03-04 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Bennett H Morton → Appalachian Bituminous Coal Company Inc; 1986-03-04 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Caudill Hubert W → No 3; 1986-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** First Class Coal Company Inc → No 3; 1987-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caudill Hubert W → First Class Coal Company Inc; 1987-01-06 to current/open; source msha-controller-operator-history