# Relationship history for MSHA mine 0800800

Current hierarchy: **Cemex S A → CEMEX Construction Materials Florida, LLC → Brooksville 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Southdown Inc → Brooksville Cement Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Florida Mining & Materials Corp → Brooksville Cement Plant; 1950-01-01 to 1988-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Moore Mc Cormack Resources Inc → Brooksville Cement Plant; 1950-01-01 to 1988-09-05; source msha-controller-operator-history
- **controller_controls_operator:** Moore Mc Cormack Resources Inc → Florida Mining & Materials Corp; 1950-01-01 to 1988-09-05; source msha-controller-operator-history
- **operator_operates_mine:** Southdown Inc → Brooksville Cement Plant; 1988-09-06 to 2000-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Southdown Inc → Southdown Inc; 1988-09-06 to 2000-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Brooksville Cement Plant; 1994-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brooksville Cement Cemex Inc → Brooksville Cement Plant; 2000-11-03 to 2010-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Brooksville Cement Cemex Inc; 2000-11-03 to 2010-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Brooksville Cement Plant; 2008-12-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CEMEX Construction Materials Florida, LLC → Brooksville Cement Plant; 2010-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → CEMEX Construction Materials Florida, LLC; 2010-03-05 to current/open; source msha-controller-operator-history