# Relationship history for MSHA mine 4406030

Current hierarchy: **Billy Ray  Dotson → B R D Coal Company Inc → Mine 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:** South Atlantic Coal Company Inc → Mine No 2; 1976-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harman Robert & Gilbert → Mine No 2; 1979-06-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Permac Inc → Mine No 2; 1984-01-01 to 1984-11-13; source msha-controller-operator-history
- **controller_controls_operator:** South Atlantic Coal Company Inc → Permac Inc; 1984-01-01 to 1984-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Harman Brothers Coal Company Inc → Mine No 2; 1984-11-14 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Harman Robert & Gilbert → Harman Brothers Coal Company Inc; 1984-11-14 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** R & O Coal Company Inc → Mine No 2; 1985-07-01 to 1988-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Nichols → Mine No 2; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Nichols → R & O Coal Company Inc; 1985-07-01 to 1988-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Billy Ray  Dotson → Mine No 2; 1987-12-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B R D Coal Company Inc → Mine No 2; 1988-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billy Ray  Dotson → B R D Coal Company Inc; 1988-06-15 to current/open; source msha-controller-operator-history