# Relationship history for MSHA mine 2103324

Current hierarchy: **Houston County-MN → Houston County Highway Department → Houston County Sand Pull**

- 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:** Houston County Highway Department → Houston County Sand Pull; 2002-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Houston County-MN → Houston County Sand Pull; 2002-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houston County-MN → Houston County Highway Department; 2002-06-24 to current/open; source msha-controller-operator-history