# Relationship history for MSHA mine 4605521

Current hierarchy: **Garbart Paul L → Garbart Brothers Inc → Garbart Bros Strip 1**

- 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:** Kelly Coal Company Inc → Garbart Bros Strip 1; 1977-05-01 to 1978-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Mc Gee Thomas L → Garbart Bros Strip 1; 1977-05-01 to 1978-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Mc Gee Thomas L → Kelly Coal Company Inc; 1977-05-01 to 1978-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Garbart Paul L → Garbart Bros Strip 1; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Garbart Brothers Inc → Garbart Bros Strip 1; 1978-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garbart Paul L → Garbart Brothers Inc; 1978-05-06 to current/open; source msha-controller-operator-history