# Relationship history for MSHA mine 0800899

Current hierarchy: **Vulcan Materials Company → Florida Rock Industries Inc → Fort Pierce 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 → Fort Pierce Mine; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** George S Pappas → Fort Pierce Mine; 1950-01-01 to 1980-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Palmetto Rock Company Inc → Fort Pierce Mine; 1978-03-09 to 1980-07-28; source msha-controller-operator-history
- **controller_controls_operator:** George S Pappas → Palmetto Rock Company Inc; 1978-03-09 to 1980-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Florida Rock Industries Inc → Fort Pierce Mine; 1980-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries Inc → Florida Rock Industries Inc; 1980-07-29 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Fort Pierce 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 current/open; source msha-controller-operator-history