# Relationship history for MSHA mine 4105532

Current hierarchy: **Angel I  Durrett; David J  Durrett → Independence TX LLC → Z&T Ranch Sand Plant**

- 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:** Independence TX LLC → Z&T Ranch Sand Plant; 2020-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Angel I  Durrett et al → Z&T Ranch Sand Plant; 2020-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Angel I  Durrett et al → Independence TX LLC; 2020-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David J  Durrett et al → Independence TX LLC; 2020-11-15 to current/open; source msha-controller-operator-history