# Relationship history for MSHA mine 3606941

Current hierarchy: **Nagle John J-John F & Michael → John J-John F & Michael Nagle → Special Reclamation Project No 650**

- 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:** John J-John F & Michael Nagle → Special Reclamation Project No 650; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nagle John J-John F & Michael → Special Reclamation Project No 650; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nagle John J-John F & Michael → John J-John F & Michael Nagle; 1980-02-01 to current/open; source msha-controller-operator-history