# Relationship history for MSHA mine 4104365

Current hierarchy: **Humberto  Guerrero → Tri Ready Mix Concrete, Inc. → Tri Ready Mix Concrete, Inc.**

- 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

- **operator_operates_mine:** Alvarez Ready Mix → Tri Ready Mix Concrete, Inc.; 2002-05-08 to 2010-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Alfredo  Alvarez → Tri Ready Mix Concrete, Inc.; 2002-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfredo  Alvarez → Alvarez Ready Mix; 2002-05-08 to 2010-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Tri Ready Mix Concrete, Inc. → Tri Ready Mix Concrete, Inc.; 2010-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Humberto  Guerrero → Tri Ready Mix Concrete, Inc.; 2010-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Humberto  Guerrero → Tri Ready Mix Concrete, Inc.; 2010-06-16 to current/open; source msha-controller-operator-history