# Relationship history for MSHA mine 3603559

Current hierarchy: **Mc Donald Fahy W (Twig) → Thomas Coal Company Inc → Thomas Strip**

- 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

- **operator_operates_mine:** Thomas Coal Company → Thomas Strip; 1950-01-01 to 1976-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Jeanine → Thomas Strip; 1950-01-01 to 1976-12-12; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Jeanine → Thomas Coal Company; 1950-01-01 to 1976-12-12; source msha-controller-operator-history
- **operator_operates_mine:** Thomas Coal Company Inc → Thomas Strip; 1976-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Donald Fahy W (Twig) → Thomas Strip; 1976-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Donald Fahy W (Twig) → Thomas Coal Company Inc; 1976-12-13 to current/open; source msha-controller-operator-history