# Relationship history for MSHA mine 4104629

Current hierarchy: **Somaiah  Kurre → Texas Concrete Sand and Gravel, Inc. → Texas Concrete Sand and Gravel, 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Alamo Aggregates Corp → Texas Concrete Sand and Gravel, Inc.; 2006-10-30 to 2015-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Gustavo (Ochoa)  Gutierrez → Texas Concrete Sand and Gravel, Inc.; 2006-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gustavo (Ochoa)  Gutierrez → Alamo Aggregates Corp; 2006-10-30 to 2015-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Somaiah  Kurre → Texas Concrete Sand and Gravel, Inc.; 2012-02-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Texas Concrete Sand and Gravel, Inc. → Texas Concrete Sand and Gravel, Inc.; 2015-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Somaiah  Kurre → Texas Concrete Sand and Gravel, Inc.; 2015-01-12 to current/open; source msha-controller-operator-history