# Relationship history for MSHA mine 0405528

Current hierarchy: **Cemex S A → CEMEX Construction Materials LP → Harbor 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 → Harbor Plant; 2001-07-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harbor Sand & Gravel → Harbor Plant; 2002-07-11 to 2006-02-05; source msha-controller-operator-history
- **controller_controls_mine:** RMC Group PLC → Harbor Plant; 2002-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RMC Group PLC → Harbor Sand & Gravel; 2002-07-11 to 2006-02-05; source msha-controller-operator-history
- **operator_operates_mine:** CEMEX Construction Materials LP → Harbor Plant; 2006-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → CEMEX Construction Materials LP; 2006-02-06 to current/open; source msha-controller-operator-history