# Relationship history for MSHA mine 4104824

Current hierarchy: **Augusto  Huerta; Walter  Huerta → Buffalo Concrete of Texas → Bowles Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Buffalo Concrete of Texas → Bowles Sand & Gravel; 2010-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Bowles → Bowles Sand & Gravel; 2010-06-15 to 2012-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Bowles → Buffalo Concrete of Texas; 2010-06-15 to 2012-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Augusto  Huerta et al → Bowles Sand & Gravel; 2012-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Augusto  Huerta et al → Buffalo Concrete of Texas; 2012-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter  Huerta et al → Buffalo Concrete of Texas; 2012-11-08 to current/open; source msha-controller-operator-history