# Relationship history for MSHA mine 4607256

Current hierarchy: **Huff Thomas L → Buck Company Inc → Mine #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:** Bailes Thomas → Mine #2; 1983-09-01 to 1992-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Thomas Bailes Coal Company Inc → Mine #2; 1987-01-01 to 1992-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Bailes Thomas → Thomas Bailes Coal Company Inc; 1987-01-01 to 1992-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Buck Company Inc → Mine #2; 1992-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Huff Thomas L → Mine #2; 1992-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Huff Thomas L → Buck Company Inc; 1992-11-19 to current/open; source msha-controller-operator-history