# Relationship history for MSHA mine 0401797

Current hierarchy: **Jeff  Hansen → Hansen Bros Enterprises → Bear River 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Hansen Bros Enterprises → Bear River Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Hansen et al → Bear River Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Hansen et al → Hansen Bros Enterprises; 1950-01-01 to current/open; source msha-controller-operator-history