# Relationship history for MSHA mine 4003481

Current hierarchy: **Buzzi S p A → Buzzi Unicem USA → Thurman Mine**

- 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:** Buzzi S p A → Thurman Mine; 1982-08-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sharon Thurman Lumber Company, LLC → Thurman Mine; 2017-09-11 to 2026-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Sharon  Thurman → Thurman Mine; 2017-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sharon  Thurman → Sharon Thurman Lumber Company, LLC; 2017-09-11 to 2026-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Buzzi Unicem USA → Thurman Mine; 2026-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buzzi S p A → Buzzi Unicem USA; 2026-04-01 to current/open; source msha-controller-operator-history