# Relationship history for MSHA mine 0600712

Current hierarchy: **Rosario  Cassata; Roberto  Nicolia → Northeast Site Development LLC → Oak Ledge Properties 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Northeast Site Development LLC → Oak Ledge Properties LLC; 2004-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rosario  Cassata et al → Oak Ledge Properties LLC; 2004-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rosario  Cassata et al → Northeast Site Development LLC; 2004-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roberto  Nicolia et al → Northeast Site Development LLC; 2004-02-12 to current/open; source msha-controller-operator-history