# Relationship history for MSHA mine 0801216

Current hierarchy: **Cemex S A → CEMEX Construction Materials Florida, LLC → PALMDALE 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:** Florida Rock Industries Inc → PALMDALE SAND MINE; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Daniel R  Harper → PALMDALE SAND MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → PALMDALE SAND MINE; 1982-10-27 to 2003-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Harper Brothers Inc → PALMDALE SAND MINE; 1994-03-01 to 1999-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Harper → Harper Brothers Inc; 1994-03-01 to 1999-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Florida Rock Industries Inc → PALMDALE SAND MINE; 1999-06-01 to 1999-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries Inc → Florida Rock Industries Inc; 1999-06-01 to 1999-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Rinker Materials Of Florida Inc → PALMDALE SAND MINE; 1999-12-03 to 2008-12-03; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Rinker Materials Of Florida Inc; 1999-12-03 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → PALMDALE SAND MINE; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Rinker Materials Of Florida Inc; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → PALMDALE SAND MINE; 2007-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Rinker Materials Of Florida Inc; 2007-07-10 to 2008-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → PALMDALE SAND MINE; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Florida Rock Industries Inc; 2007-11-16 to 1999-12-02; source msha-controller-operator-history
- **operator_operates_mine:** CEMEX Construction Materials Florida, LLC → PALMDALE SAND MINE; 2008-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → PALMDALE SAND MINE; 2008-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → CEMEX Construction Materials Florida, LLC; 2008-12-04 to current/open; source msha-controller-operator-history