# Relationship history for MSHA mine 3606672

Current hierarchy: **Cambell Tommye-David A Leytze → C & S Coal Reclamation → Buffington**

- 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:** C & S Coal Reclamation → Buffington; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cambell Tommye-David A Leytze Et Al → Buffington; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cambell Tommye-David A Leytze Et Al → C & S Coal Reclamation; 1978-05-01 to current/open; source msha-controller-operator-history