# Relationship history for MSHA mine 0800159

Current hierarchy: **Quikrete Holdings Inc. → Quikrete Construction Materials LLC → Tampa Cement Grinding 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:** Florida Rock Industries Inc → Tampa Cement Grinding Plant; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** General Portland Inc → Tampa Cement Grinding Plant; 1950-01-01 to 1981-11-11; source msha-controller-operator-history
- **controller_controls_mine:** General Portland Inc → Tampa Cement Grinding Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Portland Inc → General Portland Inc; 1950-01-01 to 1981-11-11; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Florida Inc → Tampa Cement Grinding Plant; 1981-11-12 to 2003-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Tampa Cement Grinding Plant; 1981-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Florida Inc; 1981-11-12 to 2003-08-12; source msha-controller-operator-history
- **operator_operates_mine:** Florida Rock Industries Inc → Tampa Cement Grinding Plant; 2003-08-13 to 2014-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries Inc → Florida Rock Industries Inc; 2003-08-13 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Tampa Cement Grinding Plant; 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 2014-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Cementos Argos S A → Tampa Cement Grinding Plant; 2011-10-03 to 2023-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Quikrete Construction Materials LLC → Tampa Cement Grinding Plant; 2014-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cementos Argos S A → Quikrete Construction Materials LLC; 2014-03-08 to 2023-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Tampa Cement Grinding Plant; 2023-01-12 to 2025-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Quikrete Construction Materials LLC; 2023-01-12 to 2025-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Holdings Inc. → Tampa Cement Grinding Plant; 2025-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → Quikrete Construction Materials LLC; 2025-08-04 to current/open; source msha-controller-operator-history