# Relationship history for MSHA mine 3608388

Current hierarchy: **Leonard O  Swisher Jr → Swisher Contracting Inc → Swisher Contracting #2**

- 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

- **controller_controls_mine:** Leonard O  Swisher Jr → Swisher Contracting #2; 1984-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Swisher Contracting Inc → Swisher Contracting #2; 1993-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard O  Swisher Jr → Swisher Contracting Inc; 1993-02-01 to current/open; source msha-controller-operator-history