# Relationship history for MSHA mine 2901331

Current hierarchy: **Barry J  Lytle → Westar Concrete & Construction, Inc. → Westar**

- 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:** Griego'S Trucking Company Inc → Westar; 1950-01-01 to 2007-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Ben T  Griego → Westar; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ben T  Griego → Griego'S Trucking Company Inc; 1950-01-01 to 2007-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Westar Concrete & Construction, Inc. → Westar; 2007-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barry J  Lytle → Westar; 2007-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barry J  Lytle → Westar Concrete & Construction, Inc.; 2007-05-29 to current/open; source msha-controller-operator-history