# Relationship history for MSHA mine 4105572

Current hierarchy: **Buzzi S p A → Alamo Concrete Products Company → Bastrop Plant**

- 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 → Bastrop Plant; 1988-12-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alamo Concrete Products Company → Bastrop Plant; 2021-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buzzi S p A → Alamo Concrete Products Company; 2021-07-29 to current/open; source msha-controller-operator-history