# Relationship history for MSHA mine 4202786

Current hierarchy: **John L Lewis → Bridges Holding Company LLC → Bridges gravel pit**

- 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:** Bridges Holding Company LLC → Bridges gravel pit; 2025-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John L Lewis → Bridges gravel pit; 2025-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L Lewis → Bridges Holding Company LLC; 2025-06-10 to current/open; source msha-controller-operator-history