# Relationship history for MSHA mine 4103595

Current hierarchy: **Buzzi S p A → Alamo Concrete Products Company → SOUTH-TEX QUARRY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Fred  Palacios et al → SOUTH-TEX QUARRY; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Buzzi S p A → SOUTH-TEX QUARRY; 1988-12-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Texas Gravel Inc → SOUTH-TEX QUARRY; 1990-01-01 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Palacios et al → Texas Gravel Inc; 1990-01-01 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Juan  Palacios et al → Texas Gravel Inc; 1990-01-01 to 2007-07-08; source msha-controller-operator-history
- **operator_operates_mine:** SOUTH-TEX CONCRETE → SOUTH-TEX QUARRY; 2007-07-09 to 2009-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Buzzi S p A → SOUTH-TEX QUARRY; 2007-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buzzi S p A → SOUTH-TEX CONCRETE; 2007-07-09 to 2009-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Alamo Concrete Products Company → SOUTH-TEX QUARRY; 2009-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buzzi S p A → Alamo Concrete Products Company; 2009-05-18 to current/open; source msha-controller-operator-history