# Relationship history for MSHA mine 0901135

Current hierarchy: **Frank  Foley → Columbus Quarry LLC → Columbus Quarry LLC**

- 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 → Columbus Quarry LLC; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Florida Rock Industries Inc → Columbus Quarry LLC; 2000-11-01 to 2001-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries Inc → Florida Rock Industries Inc; 2000-11-01 to 2001-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Columbus Quarry LLC → Columbus Quarry LLC; 2001-11-01 to 2008-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Florida Rock Industries Inc → Columbus Quarry LLC; 2001-11-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries Inc → Columbus Quarry LLC; 2001-11-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Columbus Quarry LLC; 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 2001-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Columbus Quarry LLC; 2007-11-16 to 2008-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Columbus Quarry LLC → Columbus Quarry LLC; 2008-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Foley → Columbus Quarry LLC; 2008-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Foley → Columbus Quarry LLC; 2008-04-14 to current/open; source msha-controller-operator-history