# Relationship history for MSHA mine 0404056

Current hierarchy: **Cemex S A → Cemex → Davenport Cement 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

- **operator_operates_mine:** Lone Star Industries Inc → Davenport Cement Plant; 1950-01-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc → Davenport Cement Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1950-01-01 to 1987-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Cemex → Davenport Cement Plant; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** RMC Group PLC → Davenport Cement Plant; 1988-01-01 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_operator:** RMC Group PLC → Cemex; 1988-01-01 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Davenport Cement Plant; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex; 2005-03-01 to current/open; source msha-controller-operator-history