# Relationship history for MSHA mine 0203293

Current hierarchy: **Cemex S A → CEMEX Construction Materials South LLC → Wellton Aggregate 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Cemex S A → Wellton Aggregate Plant; 2008-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CEMEX Construction Materials South LLC → Wellton Aggregate Plant; 2012-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → CEMEX Construction Materials South LLC; 2012-01-18 to current/open; source msha-controller-operator-history