# Relationship history for MSHA mine 0800635

Current hierarchy: **Titan Cement International S A → Titan Florida LLC → Center Sand Company**

- 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

- **operator_operates_mine:** Silver Sand Company Of Clermont Inc → Center Sand Company; 1950-01-01 to 1985-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Rodney T  Griffin → Center Sand Company; 1950-01-01 to 1985-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Rodney T  Griffin → Silver Sand Company Of Clermont Inc; 1950-01-01 to 1985-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Tarmac Plc → Center Sand Company; 1984-12-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac Florida Inc → Center Sand Company; 1985-04-22 to 2000-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Tarmac Plc → Tarmac Florida Inc; 1985-04-22 to 2000-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac Florida Inc → Center Sand Company; 2000-10-03 to 2007-08-02; source msha-controller-operator-history
- **controller_controls_mine:** Titan Cement International S A → Center Sand Company; 2000-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Titan Cement International S A → Tarmac Florida Inc; 2000-10-03 to 2007-08-02; source msha-controller-operator-history
- **controller_controls_mine:** Titan Cement International S A → Center Sand Company; 2003-07-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Titan Florida LLC → Center Sand Company; 2007-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Titan Cement International S A → Titan Florida LLC; 2007-08-03 to current/open; source msha-controller-operator-history