# Relationship history for MSHA mine 0800345

Current hierarchy: **Howard  Murrell → Quality Enterprises USA, Inc. → Sunniland 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Florida Rock Industries Inc → Sunniland Mine; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Century Industries → Sunniland Mine; 1950-01-01 to 1984-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Florida Rock Industries  et al → Sunniland Mine; 1950-01-01 to 1984-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries  et al → Century Industries; 1950-01-01 to 1984-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Florida Rock Industries Inc → Sunniland Mine; 1984-01-10 to 2022-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries Inc → Florida Rock Industries Inc; 1984-01-10 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Sunniland 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 2022-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Quality Enterprises USA, Inc. → Sunniland Mine; 2022-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Howard  Murrell → Sunniland Mine; 2022-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard  Murrell → Quality Enterprises USA, Inc.; 2022-07-27 to current/open; source msha-controller-operator-history