# Relationship history for MSHA mine 0801470

Current hierarchy: **Cemex S A → Cemex Construction Materials Florida LLC → Four Corners Sand Mine**

- 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

- **controller_controls_mine:** Cemex S A → Four Corners Sand Mine; 2008-12-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Construction Materials Florida LLC → Four Corners Sand Mine; 2026-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Construction Materials Florida LLC; 2026-01-01 to current/open; source msha-controller-operator-history