# Relationship history for MSHA mine 4101363

Current hierarchy: **Buzzi S p A → Alamo Concrete Products Company → Alamo Con Prod  Eagle Pass S & G**

- 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:** B H & S Materials Inc → Alamo Con Prod  Eagle Pass S & G; 1950-01-01 to 1982-12-29; source msha-controller-operator-history
- **controller_controls_mine:** W W  Ballard → Alamo Con Prod  Eagle Pass S & G; 1950-01-01 to 1982-12-29; source msha-controller-operator-history
- **controller_controls_operator:** W W  Ballard → B H & S Materials Inc; 1950-01-01 to 1982-12-29; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Sand & Gravel → Alamo Con Prod  Eagle Pass S & G; 1982-12-30 to 1992-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Vaughan & Sons Inc → Alamo Con Prod  Eagle Pass S & G; 1982-12-30 to 1992-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Vaughan & Sons Inc → Eagle Sand & Gravel; 1982-12-30 to 1992-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Buzzi S p A → Alamo Con Prod  Eagle Pass S & G; 1988-12-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alamo Concrete Products Company → Alamo Con Prod  Eagle Pass S & G; 1992-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buzzi S p A → Alamo Concrete Products Company; 1992-06-20 to current/open; source msha-controller-operator-history