# Relationship history for MSHA mine 0900407

Current hierarchy: **Concrete Enterprises, LLC; Oxford Construction Company → South Georgia Sand, LLC → Bainbridge Sand 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

- **controller_controls_mine:** Florida Rock Industries Inc → Bainbridge Sand Plant; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Southern Concrete Construction Company Inc → Bainbridge Sand Plant; 1950-01-01 to 2000-06-08; source msha-controller-operator-history
- **controller_controls_mine:** W L  Maddox → Bainbridge Sand Plant; 1950-01-01 to 2000-06-08; source msha-controller-operator-history
- **controller_controls_operator:** W L  Maddox → Southern Concrete Construction Company Inc; 1950-01-01 to 2000-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Florida Rock Industries Inc → Bainbridge Sand Plant; 2000-06-09 to 2019-03-28; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries Inc → Florida Rock Industries Inc; 2000-06-09 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Bainbridge Sand 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 2019-03-28; source msha-controller-operator-history
- **operator_operates_mine:** South Georgia Sand, LLC → Bainbridge Sand Plant; 2019-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Concrete Enterprises, LLC et al → Bainbridge Sand Plant; 2019-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Concrete Enterprises, LLC et al → South Georgia Sand, LLC; 2019-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oxford Construction Company et al → South Georgia Sand, LLC; 2019-03-29 to current/open; source msha-controller-operator-history