# Relationship history for MSHA mine 4202286

Current hierarchy: **Philip N  Levin → Levin Stone Company Inc → LEVIN STONE**

- 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:** Philip N  Levin → LEVIN STONE; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Levin Stone Company Inc → LEVIN STONE; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip N  Levin → Levin Stone Company Inc; 2000-05-01 to current/open; source msha-controller-operator-history