# Relationship history for MSHA mine 2103617

Current hierarchy: **Christopher  Tilberg → Northland Aggregate Inc → Wash Plant**

- 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:** Christopher  Tilberg → Wash Plant; 2008-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northland Aggregate Inc → Wash Plant; 2008-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Tilberg → Northland Aggregate Inc; 2008-05-13 to current/open; source msha-controller-operator-history