# Relationship history for MSHA mine 4104768

Current hierarchy: **Susan  Hurst; Robin K  Hurst → WesTex Stone, Inc → WesTex Stone, 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:** Rock and Stone Unlimited → WesTex Stone, Inc; 2008-12-01 to 2011-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Robin K  Hurst et al → WesTex Stone, Inc; 2008-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robin K  Hurst et al → Rock and Stone Unlimited; 2008-12-01 to 2011-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Keith E  Hurst et al → Rock and Stone Unlimited; 2008-12-01 to 2011-10-31; source msha-controller-operator-history
- **operator_operates_mine:** WesTex Stone, Inc → WesTex Stone, Inc; 2011-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Susan  Hurst et al → WesTex Stone, Inc; 2011-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Hurst et al → WesTex Stone, Inc; 2011-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robin K  Hurst et al → WesTex Stone, Inc; 2011-11-01 to current/open; source msha-controller-operator-history