# Relationship history for MSHA mine 4002967

Current hierarchy: **Bouldin La Due → J & B Coal Company Inc → No 49**

- 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:** Thomas Virgil C Et Al → No 49; 1983-12-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thomas Coal Company Inc → No 49; 1988-01-01 to 1989-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Virgil C Et Al → Thomas Coal Company Inc; 1988-01-01 to 1989-03-22; source msha-controller-operator-history
- **operator_operates_mine:** J & J Coal Company Inc → No 49; 1989-03-23 to 1991-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Morrison Jackie B → No 49; 1989-03-23 to 1991-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Morrison Jackie B → J & J Coal Company Inc; 1989-03-23 to 1991-12-09; source msha-controller-operator-history
- **operator_operates_mine:** J & B Coal Company Inc → No 49; 1991-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bouldin La Due → No 49; 1991-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bouldin La Due → J & B Coal Company Inc; 1991-12-10 to current/open; source msha-controller-operator-history