# Relationship history for MSHA mine 3607304

Current hierarchy: **Cambell Tommye-David A Leytze → M B T Coal Reclamation Company → M B T Reclamation Co**

- 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:** M B T Coal Reclamation Company → M B T Reclamation Co; 1982-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cambell Tommye-David A Leytze Et Al → M B T Reclamation Co; 1982-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cambell Tommye-David A Leytze Et Al → M B T Coal Reclamation Company; 1982-04-01 to current/open; source msha-controller-operator-history