# Relationship history for MSHA mine 0800549

Current hierarchy: **Dravo Corp → Florida Agglite Corp → Florida Agglite**

- 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 Agglite Corp → Florida Agglite; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dravo Corp → Florida Agglite; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dravo Corp → Florida Agglite Corp; 1950-01-01 to current/open; source msha-controller-operator-history