# Relationship history for MSHA mine 4200012

Current hierarchy: **Hansen J Weston → Wilford H Hansen Stone Quarries Inc → Browns Canyon Qy**

- 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:** Wilford H Hansen Stone Quarries Inc → Browns Canyon Qy; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hansen J Weston → Browns Canyon Qy; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hansen J Weston → Wilford H Hansen Stone Quarries Inc; 1950-01-01 to current/open; source msha-controller-operator-history