# Relationship history for MSHA mine 3610422

Current hierarchy: **Leonard A  Rossi → Rossi Excavating Company → Beaver Brook Development Project**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Leonard A  Rossi → Beaver Brook Development Project; 1983-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rossi Excavating Company → Beaver Brook Development Project; 2023-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard A  Rossi → Rossi Excavating Company; 2023-06-27 to current/open; source msha-controller-operator-history