# Relationship history for MSHA mine 0801052

Current hierarchy: **Henson Steve → Florida Keys Fill Inc → No Name Key Quarry**

- 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:** Florida Keys Fill Inc → No Name Key Quarry; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henson Steve → No Name Key Quarry; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henson Steve → Florida Keys Fill Inc; 1987-01-01 to current/open; source msha-controller-operator-history