# Relationship history for MSHA mine 2302589

Current hierarchy: **Daniel  Bruns; Patrick  Wessels → Smith Sand and Gravel → Smith Sand and Gravel Salem**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Patrick  Wessels → Smith Sand and Gravel Salem; 2018-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smith Sand and Gravel → Smith Sand and Gravel Salem; 2024-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick  Wessels → Smith Sand and Gravel; 2024-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel  Bruns → Smith Sand and Gravel; 2024-05-06 to current/open; source msha-controller-operator-history